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Launching in 3, 2… Here’s why Bitcoin breaking $40,000 is different than last time – Cointelegraph

The price of Bitcoin (BTC) broke above $40,000 on Feb. 6 for the first time in 23 days. But this time, the market sentiment is a lot calmer with a less overheated derivatives market.

The combination of a less crowded Bitcoin futures market, the selling pressure from whales peaking, and a fast recovery could help BTC stabilize above $40,000 this time.

On Jan. 29, a pseudonymous Bitcoin researcher and analyst known as Material Scientist said that mega whale order flow reached an all-time high.

This means that the selling pressure coming from whales dealing with $1 million to $10 million orders reached a record-high. The analyst said at the time:

If the price of Bitcoin establishes $40,000 as a new support area, it would establish a highly positive short-term price trend for BTC.

It would mean that BTC can now rally towards its all-time high without the massive selling pressure coming from major whales and high-net-worth investors.

In the near term, for Bitcoin to maintain its bullish structure, it would need to protect two key support levels: $40,000 and $37,834.

Meanwhile, according to the analysts at Whalemap, a data analytics platform that tracks whale data, there is a confluence of whale supports at $37,834 and $36,290.

If Bitcoin breaks down from $40,000, these two support areas would be critical to defend. Below these two levels would likely result in a short-term bearish trend. The analysts wrote:

In the foreseeable future, some traders anticipate Bitcoin to surge beyond $60,000 with the momentum from the ongoing rally.

Scott Melker, a cryptocurrency trader, said there will be pullbacks, but Bitcoin would likely reach $63,000 following the breakout. He said:

Bitcoin technically broke out of the bull flag when it surpassed $38,000 on Feb. 4. Considering that Bitcoin is looking stronger than the last time it broke $40,000 a month ago, there is sufficient momentum to carry it past $50,000this time around.

A potential catalyst in the near term could be Guggenheim potentially confirming its investment in Bitcoin after securing the rights to invest in the Grayscale Bitcoin Trust in February.

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How Airbus And Boeing Are Using Artificial Intelligence To Advance Autonomous Flight – Simple Flying

Pilot-less jetliners may still be far off in the future due to several reasons, public trust in automated systems not being the least of them. However, this does not mean the software technology to support such operations has not developed in leaps and bounds. While there are several start-ups in tech-driven unmanned airborne vehicles, lets take a look at how the two main aircraft manufacturers use artificial intelligence in the quest for safe autonomous flight.

Artificial Intelligence (AI) is a divisive subject. Some herald it as the key solution to everything from Alzheimers and cancer to food shortages and climate change. Others, more pessimistically or dystopically inclined, say it will be the end of humanity or, at the very least, take most of our jobs.

One thing is for certain, though; AI is here to stay, and it will have a massive impact on our everyday lives in the future. Aviation is often critiqued for having been slow on the ball when it comes to AI. However, things have begun to change, and its various applications will transform the industry in the decades to come.

Data-driven sophisticated algorithms will revolutionize everything from ticket pricing, air traffic control, crew and maintenance schedules to aircraft assembly, natural language processing in the cockpit. And, of course, it will have an enormous impact on more advanced technology such as autonomous vision-based navigation or pilot-less planes, if you will.

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A little over a year ago, on January 16th, 2020, Airbus completed the first fully automatic vision-based take-off and landing within the framework of its Autonomous Taxi, Take-Off and Landing (ATTOL) project. Rather than relying on an Instrument Landing System (ILS), the AI-controlled take-off was governed by image-recognition software installed on the aircraft.

Image recognition is softwares ability to identify people, places, objects, etc., in images. You are involved in it every time you respond to a prompt to identify yourself as a human online by clicking on all the images containing a cross-walk, traffic light, or motorcycle. In the video below, it is clearly distinguishable how the software reads the visual input of the aircrafts surroundings to perform the take-off procedure.

The ATTOL project was completed in June last year. However, Airbus has stated that its goal is for autonomous technologies to improve flight operations and overall performance not to reach autonomous flight as a target in itself. Pilots, the planemaker says, will remain at the heart of operations.

Over in the other corner, in December 2020, Boeing completed a series of test-flights exploring how high-performance uncrewed aircraft can operate together controlled by AI using onboard command and data sharing. Aircraft were added one by one over a period of ten days until five operated as an autonomous unit, reaching speeds of up to 167 miles per hour.

The tests demonstrated our success in applying artificial intelligence algorithms to teach the aircrafts brain to understand what is required of it, Emily Hughes, director of Phantom Works, Boeings prototyping arm for its defense branch, said in a statement shared with Vision Systems Design at the time.

With the size, number and speed of aircraft used in the test, this is a very significant step for Boeing and the industry in the progress of autonomous mission systems technology, Hughes continued.

While Decembers test-flights were part of its defense part of the business, Boeing stated that the technologies developed from the program would not only inform its developmental Airpower Teaming System (ATS) but apply to all future autonomous aircraft.

Meanwhile, Boeings subsidiary Aurora Flight Sciences, part of Boeing NeXt, is building smaller autonomous flight vehicles. This includes the Centaur, configured for autonomous flight featuring a detect-and-avoid technology supported by radar.

How soon would you get on a crewless aircraft? Are you excited about the prospects of autonomous flight? What do you consider to be the main issues? Let us know in the comments.

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Bitcoin Investment In 2021: What Should We Expect? – Bitcoin Magazine

The bitcoin price has surged about 300 percent over the last 12 months thanks to mainstream adoption and institutional interest. It has rallied massively to surpassing all-time highs of $41,000. At the time of this writing, the price is hovering around $35,000 and it will be interesting to watch traders reactions and price behavior for the rest of 2021.

Bitcoins bull cycle will likely continue, especially in the second half of 2021. One of the causes of price increase will be widespread adoption. Currently, relatively few people accept and use Bitcoin in everyday life. However, we could see mainstream acceptance in the coming months. For instance, PayPal has allowed its users to buy and sell bitcoin using PayPal accounts. Also, Square invested $50 million in bitcoin. Ongoing mainstream adoption like this could boost bitcoins price significantly.

The liquidity in bitcoin has been a telltale sign that more institutional bodies are at play. Similarly, throughout 2021 the institutional interest is expected to drive the prices of bitcoin and other cryptocurrencies.

In another sign of the mainstream growth of cryptocurrencies expected in 2021, major cryptocurrency exchange Coinbase is expected to become a publicly-listed company this year. The exchanges institutional assets increased from $6 billion to a whopping $20 billion between April and November of 2020.

Caused by the U.S. dollars cyclical bear market and global liquidity, bitcoin will benefit significantly from people hedging against inflation. Many retail traders will also jump in due to the fear of missing out (FOMO), pushing the price further. Traders who will not want to invest directly in bitcoin will trade contracts for difference (CFDs) on bitcoin via forex brokers and trading platforms.

As mentioned above, in October 2020, PayPal announced that it would support buying and selling cryptocurrency. Also, other Institutions and Wall Street giants have shown interest in cryptocurrency. For instance, JPMorgan Chase & Co. and Citibank are predicting a bullish bitcoin market. According to a leaked report from Citibank, the analysts refer to bitcoin as 21st century gold predicting that it could hit $318,000 by the end of 2021. Likewise, Will Woo, a former partner at Adaptive Capital, has referred to $200,000 as a conservative price.

A note to institutional clients from Tom Fitzpatrick, the global head of CITIFX, leaked on Twitter. The note showed a chart of three bitcoin bulls in the last decade. He suggested that the bitcoin rally could hit a peak of $318,000 in December 2021. However, other analysts such as BTIG and Bloomberg have been more conservative, predicting the price will reach $50,000.

Fiscal policy and monetary policies aiming to devalue currency will work in favor of the bitcoin price. Much of the demand will come from investors who fear that the money printing will devalue conventional money. With fiat money growing out of control, bitcoin is seen as a fixed asset, just like gold.

Besides a weak monetary policy, the dollar could also be affected massively by the COVID-19 vaccine rollout. For these reasons, the demand for bitcoin might increase significantly.

While cryptocurrency proponents are exuberant, there is a possibility that bitcoin prices wont rise beyond the all-time high set in 2020. In fact, the price may fall back and remain below this mark for some time, as was the case during the 2017 rally. Some believe that the only time bitcoin is likely to reach another significant high is in 2024, following the next mining subsidy halving.

Bitcoins popularity as digital gold is spreading fast. However, unlike gold, bitcoin is experiencing its first global crisis, caused by COVID-19, as it was born in 2009 following the 2008 financial recession. The 2020 bear run in the market saw investors sell equities for cash. Even gold, which is considered by many to be a safer investment than bitcoin, dipped in March. Bitcoin crashed hard in mid-March too, but the bitcoin case was different. The cryptocurrency bounced from the bottom a month later in a bull run that continued until the end of the year.

Regulators have been scrutinizing digital currencies for years. Some people, albeit only a few, are using cryptocurrencies to engage in illegal trades and with the surging value of cryptocurrencies, governments around the world will be looking closely at the market. For instance, a lawsuit by the U.S. Securities and Exchange Commission (SEC) against altcoin project Ripple saw XRP prices fall by almost half.

Regulatory agencies could suddenly erect a hurdle to tame unscrupulous activities surrounding bitcoin, but this regulation couldnt affect bitcoins bullish run significantly.

Transactions involving different fiat currencies can take days and involve heavy fees and a global digital currency could significantly streamline this process in 2021. While bitcoin adoption is growing, the cryptocurrency could face competition to solve this problem from big tech. A good example is Facebooks digital currency and, while Facebook diem is quite different from Bitcoin, it may draw some attention away from bitcoin in 2021.

Likewise, central banks are also competing against bitcoin. As reported by Banks for International Settlements, 80 percent of central banks are on the verge of developing some form of digital currency. For instance, China is working toward the adoption of a digital yuan. In many critical ways, these central bank digital currencies will be vastly different than bitcoin.

In general, the adaptation of bitcoin in commerce is a perfect cause for price increases in 2021. While bitcoins price and adoption is expected to proliferate, we cant rule out the opposite and volatility is certainly possible.

This is a guest post by Michael. Opinions expressed are entirely their own and do not necessarily reflect those of BTC Inc or Bitcoin Magazine.

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Analysts are projecting Bitcoin will reach over $100,000, here is what you need to know – Financial Post

This article was created by StackCommerce. While Postmedia may collect a commission on sales through the links on this page, we are not being paid by the brands mentioned.

Weve all heard about the future of money, and its ultimate evolution to a digital form. After all, people dictate what constitutes money. At the end of the day, its a social construct, and society is very interested in cryptocurrencyits not a blip or a fad to be dismissed. This means, even if youre not looking to invest, you need to stay informed so you dont get caught off-guard should a mass shift happen swiftly.

Bitcoin had surge in 2020. Sure, some analysts are saying that growth is unsustainable, but theyre also saying its a legitimate currency competing against a commodity like gold and could hit $146,000. That means, more people are turning to digital gold and driving the demand for cryptocurrency. The more you know about it, the better you can prepare yourself financially in the future.

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Bitcoin serves none of the functions ‘money’ does: Why is it so valuable? – SmartCompany.com.au

Its staggering to think that $100 invested in Apple in 2004 is worth $52,000 today. Thats a return of 44% per annum.

As eye-watering as these returns may be, they are dwarfed by the returns on investments in cryptocurrencies $100 worth of Bitcoin invested 10 years ago has grown to $12 million, or 222% per annum.

So, what is it about Bitcoins value that has led to this astonishing increase in its price?

Apple generates value by designing and manufacturing its products and services such as laptops, phones and streaming services.

Bitcoin, on the other hand, is a decentralised cryptocurrency that aims to serve as money. The function of money includes serving as unit of account (allowing the valuation of goods in the same unit such as the Australian dollar), as a medium of exchange (one can buy and sell goods using the currency), and as a store of value (one can keep the currency for future use).

The value of money to its users depends on how well it serves these functions. It could be argued that at present, Bitcoin serves none of these functions.

One key issue with Bitcoin has been the high volatility of its price. In the last five years, there were more than 100 days where the price of Bitcoin fluctuated by 5% or more.

This makes Bitcoin unattractive as a store of value. A certain amount of Bitcoin might buy you cappuccino today, but the same amount might only buy you a babyccino (or around half a coffee) the next day.

No one with an interest in storing value would want to hold Bitcoin for any period of time as a result.

The same issue makes Vitcoin unattractive as a medium of exchange. Imagine a farmer who sold her produce in exchange for Bitcoin because of the high uncertainty about how valuable Bitcoin will be the next day when she needs to pay for her own expenses.

Currently, only a handful of merchants accept Bitcoin as mode of payment in Australia.

In addition to buying coffee at a few select places, you can pay bills at Australia Post using Bitcoins (albeit at a very high transaction fee of about 7%).

A key factor underpinning a currencys adoption as money is the trust that society places in it.

Trust in modern-day currencies (such as the Australian dollar) is largely based on peoples trust in the government that issues the currency. The Australian government, through the Reserve Bank, controls the supply of money and guarantees its stability.

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The Australian dollar is also legal tender in Australia, which means that an Australian store cannot refuse to accept Australian dollars as a mode of payment.

The question then is why Bitcoins value has increased so much?

One possible explanation is that its investors expect Bitcoin to offer value in the future (even if its current adoption is sparse). There has been recent interest from financial institutions in Bitcoin, and this could have raised the expectation of it being a serious player in the currency space.

Another point is that the technologies on which Bitcoin is based, in particular the blockchain, do provide value.

Blockchain (in its various flavours) has been adopted to solve fundamental problems in various domains, such as transport and securities trading this is the space that one should watch closely.

Bitcoin, in the end, is just one of the applications of blockchain.

So, trust in Bitcoin is based on trust in its underlying blockchain technology.

Bitcoins blockchain is a publicly available distributed database of all historical transactions. These transactions are verified by so-called miners who are incentivised (by means of rewarding them with Bitcoins) to include only legal Bitcoin transactions in the blockchain.

Bitcoins code is administered by a handful of people and no known accountable entity.

The fact that trust emanates from the crowd (decentralisation) means that, to predict how trust in Bitcoin may evolve, we need to understand how crowds behave.

Unfortunately, the science on that is not optimistic.

Crowds may be trusted for a long time, but are easily affected by free riding, and certainly dont make rational decisions even if populated by rational agents, outlined in Arrows Theorem. This has implications for the process of deciding on rules that govern cryptocurrencies.

For example, a major risk with Bitcoin is that a group could create its own variant, effectively creating its own new currency. If the new currency gains widespread adoption then the old currency may devalue, potentially wiping out the value of peoples holdings.

But theres another issue that casts doubt on the future of Bitcoin as money.

Central banking theory and history tell us that it is difficult to have two or more parallel currencies. In order to be effective, the monetary policy tools used by central banks require strong control over the local currency.

Governments, like ours in Australia, are unlikely to give up control over their own currency anytime soon.

So, should we expect society to ever adopt Bitcoin as money?

At present, it looks unlikely. But there are special cases where use of Bitcoin does provide value as money.

One example is a situation where the value of a local currency in a country fluctuates more than the value of Bitcoin. In this case, people may prefer to use Bitcoin and were already seeing an example of that in Venezuela.

Alternatively, the fact that Bitcoin is decentralised and, as a result, beyond the power of any government, may facilitate international transfers aimed to bypass sanctions.

For most other purposes like buying a coffee or paying bills, cryptocurrencies at least right now provide a fun factor but not much utility.

This article was first published on Pursuit. Read theoriginal article.

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Sparta Brothers Make Food Pantry and Gift Bags Donations from Chess Tutoring Proceeds – TAPinto.net

SPARTA, NJ - A trio of Sparta brothers have turned their love of chess into an opportunity to give back to the community. Akshat, Ayush and Aneesh Iyermade a donation to the Sparta Ecumenical Food Pantry as well as donating gift bags to nurses at Newton and Morristown Medical Centers.

The gift bags were coordinated by Carrie Radigan according to the boys' mother Anshu Yadav.

The boys have been teaching chess for years to people of all ages. This year they are teaching virtually and sharing the proceeds of their tuition with local charities.

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The boys, all members of the Sparta Chess Club, have offered chess camps in the summer but the pandemic required them to make adjustments. They have been competing in online tournaments with the Sparta Chess Club under coach Tom Murray.

Chess for Charity will continue and they will continue to make donations to the food pantry till COIVD is in control, hopefully by spring or summer,Yadav said.

Anyone interested in Chess tutoring by the Iyer brothers can email their parents at iyerschessclub@gmail.com.

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Girls Club to Host John Leguizamo of Critical Thinking – uschess.org

Our girls club programming continues with a special edition on February 11th at 4:30 PM EST on the acclaimed film, Critical Thinking. The film, which released on September 2020, is based on the true story of the 1998 National High School Championship team, MiamiJackson.The event will feature lead actor, comedian and producer John Leguizamo. Executive Producer Carla Berkowitz and former US Junior and High School Champion FM Marcel Martinez will also appear. Marcel was board one for Miami-Jackson in 1998, and was memorably depicted byJeffry Batista in the film.

Sign up for the girls club here: https://forms.gle/1bS1yxs1ixwvPWyd7

Check out the Critical Thinking trailer and find the full movie on Apple, Amazon, YouTube, among other platforms.

The weekly club for US Chess members (renew here)has been meeting since March, and guests have included 13th World Champion Garry Kasparov, 8-time US Women's Champion Irina Krush, IM and chess personalityAnna Rudolf,author WIM Sabrina Chevannes and most recently, the Botez sisters.

Find out more about US Chess Women and our work. Sign up for the Critical Thinking event here,and forthe general girls club mailing list here.We also have adult women chess classes.

Flyer photo by John Daly.

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Learn more chess strategies and improve your knowledge to win with Legal Attack – Yahoo Finance

TipRanks

Lets talk about risk and the big picture. Its an appropriate time, as the big risk presented by the COVID-19 pandemic is finally receding thanks to the ongoing vaccination program. COVID is leaving behind an economy that was forced into shutdown one year ago while in the midst of a great expansion, boosted by the deregulation policies. While the new Biden Administration is busy reversing many Trump policies, at least for now the economy is rebounding. And this brings us to risk. A time of economic growth and rebound is a forgiving time to move toward risk investments, as general economic growth tends to lift everything. Two strategists from JPMorgan have recently chimed in, promoting the view that the markets fundamentals are still sound, and that small- to mid-cap sector is going to keep rising. First, on the general conditions, quant strategist Dubravko Lakos-Bujas wrote, Although the recent technical selloff and short squeeze is receiving a lot of attention, we believe the positive macro setup, improving fundamentals and COVID-19 outlook, strength of the US consumer, as well as the reflation theme remain the bigger forces at play. Not only should this drive further equity upside, but it remains favorable for continued rotation into economic reopening Building on this, Eduardo Lecubarr, chief of the Small/Mid-Cap Strategy team, sees opportunity for investors now, especially in the smaller value stocks. We stick to our view that 2021 will be a stockpickers paradise with big money-making opportunities if you are willing to go against the grain Many macro indicators did fall in January but SMid-Caps and equities in general continued to edge higher, Lecubarr noted. And if you are prone to look at high-risk, small- to mid-cap stocks, youll find yourself drawn to penny stocks. The risk involved with these plays scares off the faint hearted as very real problems like weak fundamentals or overwhelming headwinds could be masked by the low share prices. So, how should investors approach a potential penny stock investment? By taking a cue from the analyst community. These experts bring in-depth knowledge of the industries they cover and substantial experience to the table. Bearing this in mind, we used TipRanks database to find two compelling penny stocks, according to Wall Street analysts. Both tickers boast a Strong Buy consensus rating and could climb over 200% higher in the year ahead. CNS Pharmaceuticals (CNSP) We will start with CNS Pharmaceuticals, a biotechnology company with a focus on the treatment of glioblastomas, a class of aggressive tumors that attack the braid and spinal cord. These cancers, while rare, are almost always terminal, and CNS is working a new therapy designed to more effectively cross the blood-brain barrier to attack glioblastoma. Berubicin, CNSs flagship drug candidate, is an anthracycline, a potent class of chemotherapy drugs derived from the Streptomyces bacteria strains, and used in the treatment of a wide variety of cancers. Berubicin is the first drug in this class to show promise against glioblastoma cancers. The drug candidate has completed its Phase 1 clinical trial, in which 44% of patients showed a clinical response. This number included one patient who showed a Durable Complete Response, defined as a demonstrated lack of detectable cancer. Following the success of the Phase 1 study, CNS applied for, and received, FDA approval of its Investigational New Drug application. This gives the company the go-ahead to conduct a Phase 2 study on adult patients, an important next step in the development of the drug. CNS plans to start the mid-stage trial in 1Q21. Based on the potential of the companys asset in glioblastoma, and with its share price at $2.22, several analysts believe that now is the time to buy. Among the bulls is Brooklines 5-star analyst Kumaraguru Raja who takes a bullish stance on CNSP shares. Until now, the inability of anthracyclines to cross the blood brain barrier prevented its use for treatment of brain cancers. Berubicin is the first anthracycline to cross the blood-brain barrier in adults and access brain tumors Berubicin has promising clinical data in a Phase 1 trial in recurrent glioblastoma (rGBM) and has Orphan drug designation for treatment of malignant gliomas from the FDA. We model approval of Berubicin for treatment of recurrent glioblastoma in 2025 based on the Phase 2 data with 55% probability of success for approval. We model peak sales of $533 million in 2032, Raja opined. CNS pipeline also includes WP1244 (novel DNA binding agent) that is 500x more potent than daunorubicin in inhibiting tumor cell proliferation is expected to enter the clinic in 2021 In vivo testing in orthotopic models of brain cancer showed high uptake of WP1244 by brain and subsequent antitumor activity, the analyst added. To this end, Raja rates CNSP a Buy, and his $10 price target implies room for a stunning 350% upside potential in the next 12 months. (To watch Rajas track record, click here) What does the rest of the Street have to say? 3 Buys and 1 Hold add up to a Strong Buy consensus rating. Given the $8.33 average price target, shares could climb ~275% in the year ahead. (See CNSP stock analysis on TipRanks) aTyr Pharma (LIFE) The next stock were looking at, aTyr Pharma, has a focus on inflammatory disease. Its leading drug candidate, ATYR1923, is a Neuropilin-2 (NRP2) agonist, working through the receptor proteins expressed by the NRP2 gene. These pathways are important for cardiovascular development and disease, and play a role in the inflammatory lung disease pulmonary sarcoidosis. In December, the company reported that the drug candidate had completed enrollment of 36 patients in a Phase 1b/2a clinical trial, testing the drug in the treatment of pulmonary sarcoidosis. Results of the current study are expected in 3Q21, and will inform further trials of ATYR1923, including against other forms of inflammatory lung disease. On a more immediate note, in early January the company announced top-line results of another Phase 2 clinical involving ATRY1923 this time in the treatment of patients hospitalized with severe respiratory complications from COVID-19. The results were positive, showing that a single dose of ATYR1923 (at 3 mg/kg) resulted in a 5.5-day median recovery time. Overall, of the patients dosed in this manner, 83% saw recovery in less than one week. Covering LIFE for Roth Capital, 5-star analyst Zegbeh Jallah noted, We like the risk profile here, with two shots on goal, and updated data details from the COVID study is expected in the coming months. Also announced recently, is that data from aTyr's Pulmonary Sarcoidosis program, will be reported in 3Q21 the success of either of these studies could result in a doubling or more of the market cap as these opportunities appear to barely be accounted for by investors. In line with his optimistic approach, Jallah gives LIFE shares a Buy rating and his $15 price target suggests an impressive 277% potential upside for the coming year. (To watch Jallahs track record, click here) Other analysts are on the same page. With 2 additional Buy ratings, the word on the Street is that LIFE is a Strong Buy. On top of this, the average price target is $13.33, suggesting robust growth of ~236% from the current price of $3.97. (See LIFE stock analysis on TipRanks) To find good ideas for penny stocks trading at attractive valuations, visit TipRanks Best Stocks to Buy, a newly launched tool that unites all of TipRanks equity insights. Disclaimer: The opinions expressed in this article are solely those of the featured analysts. The content is intended to be used for informational purposes only. It is very important to do your own analysis before making any investment.

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Scientists narrow down the ‘weight’ of dark matter trillions of trillions of times – Livescience.com

Scientists are finally figuring out how much dark matter the almost imperceptible material said to tug on everything, yet emit no light really weighs.

The new estimate helps pin down how heavy its particles could be with implications for what the mysterious stuff actually is.

The research sharply narrows the potential mass of dark matter particles, from between an estimated 10^minus 24 electronvolts (eV) and 10^19 Gigaelectron volts (GeV) , to between 10^minus 3 eV and 10^7eV a possible range of masses many trillions of trillions of times smaller than before.

The findings could help dark matter hunters focus their efforts on the indicated range of particle masses or they might reveal a previously unknown force is at work in the universe, said Xavier Calmet, a professor of physics and astronomy at the University of Sussex in the United Kingdom.

Related: The 11 biggest unanswered questions about dark matter

Calmet, along with doctoral student Folkert Kuipers, also of the University of Sussex, described their efforts in a new study to be published in the March issue of Physical Letters B.

By some estimates, dark matter makes up about 83% of all the matter in the universe. Its thought only to interact with light and ordinary matter through gravity, which means it can only be seen by the way it curves light rays.

Astronomers found the first hints of dark matter when gazing at a galactic cluster in the 1930s, and theories that galaxies are threaded with and fringed by vast halos of dark matter became mainstream after the 1970s, when astronomers realized galaxies were whirling faster than they otherwise should, given how much visible matter they contained.

Related: The 12 strangest objects in the universe

Possible candidates for dark matter particles include ghostly, tiny particles known as neutrinos, theoretical dark, cold particles known as axions, and proposed weakly-interacting massive particles, or WIMPs. The new mass bounds could help eliminate some of these candidates, depending on the details of the specific dark matter model, Calmet said.

What scientists do know is that dark matter seems to interact with light and normal matter only through gravity, and not via any of the other fundamental forces; and so the researchers used gravitational theories to arrive at their estimated range for the masses of dark matter particles.

Importantly, they used concepts from theories of quantum gravity, which resulted in a much narrower range than the previous estimates, which used only Einstein's theory of general relativity.

"Our idea was a very simple one," Calmet told Live Science in an email. "It is amazing that people have not thought of this before."

Einstein's theory of general relativity is based on classical physics; it perfectly predicts how gravity works most of the time, but it breaks down in extreme circumstances where quantum mechanical effects become significant, such as at the center of a black hole.

Theories of quantum gravity, on the other hand, try to explain gravity through quantum mechanics, which can already describe the other three known fundamental forces electromagnetic force, the strong force that holds most matter together, and the weak force that causes radioactive decay. None of the quantum gravity theories, however, as yet have strong evidence to support them.

Calmet and Kuipers estimated the lower bound for the mass of a dark matter particle using values from general relativity, and estimated the upper bound from the lifetimes of dark matter particles predicted by quantum gravity theories. The nature of the values from general relativity also defined the nature of the upper bound, so they were able to derive a prediction that was independent of any particular model of quantum gravity, Calmet said.

The study found that while quantum gravitational effects were generally almost insignificant, they became important when a hypothetical dark matter particle took an extremely long time to decay and when the universe was about as old as it is now (roughly 13.8 billion years), he said.

Physicists previously estimated that dark matter particles had to be lighter than the "Planck mass" about 1.2 x 10^19 GeV, at least a 1,000 times heavier than the largest-known particles yet heavier than 10^minus 24 eV to fit with observations of the smallest galaxies known to contain dark matter, he said.

But until now, few studies had attempted to narrow the range, even though great progress had been made in understanding quantum gravity over the last 30 years, he said. "People simply did not look at the effects of quantum gravity on dark matter before."

Calmet said the new bounds for the masses of dark matter particles, could also be used to test whether gravity alone interacts with dark matter, which is widely assumed, or if dark matter is influenced by an unknown force of nature.

"If we found a dark matter particle with a mass outside the range discussed our paper, we would not only have discovered dark matter, but also very strong evidence that there is some new force beyond gravity acting on dark matter," he said.

Originally published on Live Science.

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Switching Nanolight On and Off | Columbia News – Columbia University

A team of researchers led by Columbia University has developed a unique platform to program a layered crystal, producing imaging capabilities beyond common limits on demand.

The discovery is an important step toward control of nanolight, which is lightthat can access the smallest length scales imaginable. The work also provides insights for the field of optical quantum information processing, which aims to solve difficult problems in computing and communications.

We were able to use ultrafast nano-scale microscopy to discover a new way to control our crystals with light, turning elusive photonic properties on and off at will, said Aaron Sternbach, postdoctoral researcher at Columbia who is lead investigator on the study. The effects are short-lived, only lasting for trillionths of one second, yet we are now able to observe these phenomena clearly.

The research appears Feb. 4 in the journal Science.

Nature sets a limit on how tightly light can be focused. Even in microscopes, two different objects that are closer than this limit would appear to be one. But within a special class of layered crystalline materialsknown as van de Waals crystalsthese rules can, sometimes, be broken. In these special cases, light can be confined without any limit in these materials, making it possible to see even the smallest objects clearly.

In their experiments, the Columbia researchers studied the van der Waals crystal called tungsten diselenide, which is of high interest for its potential integration in electronic and photonic technologies because its unique structure and strong interactions with light.

When the scientists illuminated the crystal with a pulse of light, they were able to change the crystals electronic structure. The new structure, created by the optical-switching event, allowed something very uncommon to occur: Super-fine details, on the nanoscale, could be transported through the crystal and imaged on its surface.

The report demonstrates a new method to control the flow of light of nanolight. Optical manipulation on the nanoscale, or nanophotonics, has become a critical area of interest as researchers seek ways to meet the increasing demand for technologies that go well beyond what is possible with conventional photonics and electronics.

Dmitri Basov, Higgins professor of physics at Columbia University, and senior author on the paper, believes the teams findings will spark new areas of research in quantum matter.

Laser pulses allowed us to create a new electronic state in this prototypical semiconductor, if only for a few pico-seconds, he said. This discovery puts us on track toward optically programmable quantum phases in new materials.

Scientists at the Max Planck Institute for the Structure and Dynamics of Matter, University of California-San Diego, University of Washington, Center for Computational Quantum PhysicsFlatiron contributed to the study, Programmable hyperbolic polaritons in van derWaals semiconductors.

The work is supported as part of Programmable Quantum Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences.

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