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A "Nano Flower," a 3-D nanostructure grown by controlled nucleation of silicon carbide nanowires on gallium catalyst particles. As the growth proceeds, individual nanowires "knit" together to form 3-D structures. This photomicrograph was taken by Ghim Wei Ho, a Ph.D. student studying nanotechnology at the University of Cambridge. Ho--who works with professor Mark Welland, head of Cambridge's Nanoscale Science Lab--makes new types of materials based on nanotechnology (this "Nano Flower" is an example of new material). Nanometer-scale wires (about one thousandth the diameter of a human hair) of a silicon-carbon material (silicon carbide) are grown from tiny droplets of a liquid metal (gallium) on a silicon surface, like the chips inside our home computers. The wires grow as a gas containing methane flows over the surface. The gas reacts at the surface of the droplets and condenses to form the wires. By changing the temperature and pressure of the growth process the wires can be controllably fused together in a natural process to form a range of new structures, including these flower-like materials. Researchers are investigating possible applications for the structures like water repellant coatings and as a base for a new type of solar cell. This image was taken with a scanning electron microscope. Image color was modified using Adobe Photoshop.
Image credit: ©Ghim Wei Ho and Prof. Mark Welland, Nanostructure Center, University of Cambridge
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Designers of solar cells may soon be setting their sights higher as a discovery by a team of researchers has revealed a class of materials that could be better at converting sunlight into energy than those currently being used in solar arrays. Their research shows how a material can be used to extract power from a small portion of the sunlight spectrum with a conversion efficiency that is above its theoretical maximum -- a value called the Shockley-Queisser limit. This finding could lead to more power-efficient solar cells.
Image credit: Drexel University/Ella Marushcenko
We might have thought that the long-term dimming of “alien megastructure” star, Tabby's Star, had been put to rest as a calibration error, but now, boffins reckon its mysterious dimming can be seen in Kepler data.…
MIT boffins reckon they've cracked one of the more difficult challenges of practical quantum computing the miniaturisation of components.…
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Scientists hoping to find signs of Martian life on the surface of the Red Planet may not be in luck.…
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Scientists are almost certain that the sterile neutrino does not exist after failing to find any sign of the ghostly particle at the IceCube Neutrino Observatory in the South Pole.…
Paul Dirac Scientist of the Day
Paul Adrien Maurice Dirac, an English mathematician and physicist, was born Aug. 8, 1902.
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Filtered sunlight gives off a blue aura inside a fumarole -- an ice tube formed around a volcanic steam vent -- atop Mount Erebus in Antarctica, the Earth's southernmost active volcano. The National Science Foundation runs the U.S. Antarctic Program (USAP). In addition to maintaining three U.S. research stations on the continent, USAP supports research projects in an array of scientific disciplines including, for example, aeronomy and astrophysics, biology and medicine, geology and geophysics, glaciology, and ocean and climate systems. Outreach such as the Antarctic Artists and Writers program and education programs are also supported. For more information about USAP, visit the program's website here.
Image credit: National Science Foundation U.S. Antarctic Program; photo by Aaron Spitzer, Raytheon Polar Services Company (1990)
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Researchers have uncovered previously hidden sources of ocean pollution along more than 20 percent of America's coastlines. The study offers the first-ever map of underground drainage systems that connect fresh groundwater and seawater, and also pinpoints sites where drinking water is most vulnerable to saltwater intrusion now and in the future. While scientists have long known that fresh water and seawater mix unseen below ground, until now they hadn't been able to pinpoint exactly where it was happening, or how much, except in limited locations.
Image credit: Image courtesy of The Ohio State University
China never fails in its high-profile scientific endeavours, so news that its Yutu lunar rover has stopped functioning is being spun as a triumph for its space program.…
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The National Institutes of Health proposed lifting its moratorium on funding for research on part-animal, part-human embryos — which raises a huge dilemma, says bioethicist Insoo Hyun.
This American Life host Ira Glass was born in Baltimore, Maryland and studied semiotics at Brown University. He has worked in public radio since the age of 19, when he started as an intern at National Public Radio, and has since worked in a number of roles including writer, editor, producer and reporter. Since 1995 he has hosted and produced radio show This American Life, which became a podcast in 2006 and attracts more than 2 million listeners every week. In 2014 it launched its wildly successful spinoff show, Serial. Ira Glass will be in the live show Three Acts, Two Dancers, One Radio Host which he describes as “like This American Life, plus dancing” at the Southbank Centre on 16 August.
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If this seems far afield from your own mathematical prowess, think of the Rio Olympics as a parallel. Every event contains stunning athleticism far beyond the ability of the average American. Still, a child imagines a goal on the playground basketball court as the winning shot for team USA. As the Olympics games are broadcast this summer, we can all live out our own Olympic-inspired dreams at community pools, volleyball courts and tracks around the country.
While we may not become Olympians during our weekly workouts, our physical training leads to stronger and healthier bodies. So too, does mathematical problem-solving for the mind. At Expii.com, a site with puzzles and problems for many levels of math training - from beginner to advanced, there is a gym, of sorts, to train for mathematics with a world-class coach. Hear it in his own words:
'After becoming the lead coach of the U.S. International Mathematical Olympiad Team, I started Expii as a way of raising the bar in math and science education,' said Po-Shen Loh. 'Instead of focusing my efforts on a handful of students, I wanted to make it possible for anyone, anywhere to become a math genius.'
Dubious about improving your math skills through general training? Interestingly, our U.S. International Mathematical Olympiad Team switched their training focus from solving mathematics competition problems to helping the team members maximize their mathematical abilities and problem-solving skills. This change in training led to back-to-back wins at the IMO and the gold medals.
While we may not all compete in the International Mathematical Olympiad, our training in math has important consequences. Our country is facing a tremendous opportunity to meet the forecasted demand for 1 million STEM-related jobs. The U.S. International Mathematical Olympiad Team was selected through a series of competitions organized by the Mathematical Association of America (MAA), the world's largest community of mathematicians, students, and enthusiasts.
Like Expii.com and math educators, the Mathematical Association of America is dedicated to building our nation's next generation of problem solvers.
'For 350,000 American students each year, the MAA's American Mathematics Competitions is their opportunity to train like an Olympian, developing skills that reach far beyond these rigorous mathematics competitions,' said Michael Pearson, MAA Executive Director, 'I look forward to continuing to develop mathematical talent in our country with U.S. team members and coach, Po-Shen Loh and to witness the passion within these students for mathematical problem-solving,'
Let's jump right into training the mind with two Olympic-related math problems posed in this week's Expii problem sets.
Problem 1: (Level 2 difficulty) Risky Routine
As written in The New Yorker, Women's Gymnastics is a sport often contested in hundredths of a point, but Simone Biles is so dominant that she wins by whole numbers. The complex scoring system is based on a Difficulty Score (predetermined by the planned routine), and an Execution Score (out of a perfect 10.0, quantifying mistakes). There is a risk/reward tradeoff, as increasingly difficult routines bring higher chances of failure. Biles's dominance comes from her ability to significantly push up her Difficulty Score while still executing the routines with extreme reliability.
To get a feel for the game theory involved, suppose that you are a gymnast planning a routine where you need to perform 8 elements. For each of these 8 elements you can attempt at a C level (for 0.3 points) or an E level (for 0.5 points) level of difficulty. Your difficulty score is the sum of these 8 numbers, and you can mix and match between C's and E's. You are 100% confident of being able to execute every element at the C level, but for each element you attempt at the E level, you risk a 50% chance of a 0.5 point deduction in your Execution score.
You know that your opponents are extremely talented. What number of elements should you attempt at the E level in order to maximize your chance of achieving a Difficulty + Execution score of at least 13?
Ready for another?
Problem 2 (Difficulty 3) Strength in Numbers
Suppose that Country A has 400 million people, Country B has 100 million people, and each country always sends its strongest person to the Olympics for weightlifting. The strength of each person is an independent Normal random variable with a common mean and variance, which is the same across both countries. What is the probability that country A wins, rounded to the nearest whole percent?
Want more help? Visit the Expii site's posting of these and other Olympic themed problems.
Get ready for inspiring Olympic performances. If it inspires you to get off the coach and exercise, remember that you can also stay on the couch and train your mind in math. Do both and you'll be a healthier you!
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Pedro Marijuán: Here at the Aragon Institute of Health Sciences (IACS) in Zaragoza, I'm investigating cellular signaling systems, social bonding, and human laughter. I and my small bioinformation group -- Jorge Navarro and Raquel del Moral -- are interested in studying everything alive that communicates: cells, organisms, people, and the way human society is structured through social bonds, i.e., language -- talking face-to-face, by phone, texting, etc. Because it's through language that human society evolved, grew complex and interesting.
People do need to talk to one another. If we don't speak, we don't feel well. Isolation is the worst scenario for human beings. Language, which was at first instrumental in humans, eventually became a necessity.
How much do people need to talk? And to whom? I'm interested in how people and communities build and maintain societal bonds through conversation and what the consequences are when that natural communication process goes awry.
To thrive, humans need to immerse themselves in social layers: An intimate layer ("family"), close friends, work relationships as well as general acquaintances. These bonds form a person's "sociotype." We have not only a genotype and phenotype, but also a "sociotype."
Suzan Mazur: You first wrote on the informational patterns of laughter 10 or so years ago. What was the thrust of that paper?
Pedro Marijuán: I highlighted the social role of laughter and peculiarities of the structure of the sounds of laughter. We've written four or five scientific papers on laughter since then. Laughter is a very, very strategic way of communicating. It connects the physiological, psychological, cognitive, emotional and social. Laughter tells a lot about a person and their environment. It's highly personal.
Why is someone laughing? Laughter may be particularly beautiful -- or out of context. Why is that? What are the main sound components we instinctively scan when we laugh? What is the emotional code attached to laughter?
Suzan Mazur: It's interesting that comedy in America used to be spontaneous, quite funny, a healthy release of tension. We had comedy from the Borscht Belt, Sid Caesar, Steve Allen, early Woody Allen, 1970s Saturday Night Live. Michael O'Donoghue -- the comedic genius behind SNL -- was a friend of mine. By the late 70s, Michael thought SNL was no longer funny. Roughly around the time he left the show. That's not a joke, by the way. Comedy now in America, at least, seems uninspired, a captive of its commercial sponsors.
Pedro Marijuán: Yes. I agree with you. I don't follow media much, but it's clear that individuals are now overloaded with new kinds of artificial information flows. When a person is systematically suffering information overloads, humor is a kind of canary in the mine, a barometer. Entering the mine, the canary dies or not. Humor, or lack of it, is an indicator of individual mental health and happiness, of a person's relationship to their social contacts and of societal health.
We are seeing a rise in the number of depressed patients. We see an amazing increase in the number of people living alone. We are witnessing the accelerated loss of what Robert Putnam calls "social capital."
The information revolution is contributing to these problems -- introducing surrogate bonds via new technologies that capture a growing portion of a person's time. People are alone, going from screen to screen, abandoning long-term rewards of face-to-face conversation, endangering their social bonds. Our very social nature is being denied, or mystified, and our sociotype is becoming dramatically flattened.
The power structure does not care about impoverishing people throughout the world through tremendous economic disruption and loss of intermediation structures; it pushes for even more disruption, impervious to the social crisis.
It is urgent that we provide a new vision for human society because this disruption and endangerment of our natural information flow touches us deep, into our cells. Science has been particularly influential in creating these strange new problems -- and in leaving them unchecked! Science must now help find the conceptual tools to address this social unease all around us.
Suzan Mazur: What do you mean by the term "information"? I once interviewed physicist Sara Walker on the subject. She's a collaborator of Paul Davies at Arizona State University. Walker defined information as "events that affect and direct the states of a dynamic system." How do you define it?
Pedro Marijuán: The term is really undefinable because it's a relative term concerning the interaction between two entities -- the object and the subject. My favorite definition is "distinction on the adjacent." You cannot have an informational relationship with anything that does not "touch" you in some way. In order to make any distinction, something has to be "adjacent" to you.
This is biologically meaningful. I've based my informational scheme of the cell on this thinking of "distinction on the adjacent" -- where molecular recognition is the essential phenomenon over which biological complexity has been developed.
Myriad distinctions are factually created in the different adjacency relationships between biomolecules within the living cell, organized in informational architectures. There are dedicated informational detectors in the cellular membrane and the cell is open to directly communicate with the environment. Signals from the environment are treated quite differently from metabolic items.
This distinction is crucial and it has been not dealt with specifically in the literature except by John Gerhart and me (at least to my best knowledge). John Gerhart was a very good developmental biologist in the 1990s, he worked on signaling pathways and developmental toxicology, and rightly emphasized the difference between signals and metabolic inputs -- and seemingly nobody paid attention to him.
Almost everybody has taken a shortcut in applying information views to life. Most have followed communication engineering (Claude Shannon). Others have taken the Turing machine view. Others von Neumann's operating system. And biosemiotics also is taking a shortcut, Peircean (Charles Sanders Peirce, "the father of pragmatism") -- though the generalization may be unjust for some biosemiotic works.
Nobody's doing the deep thinking about the central issue: How information pervades cellular self-production and cellular communication. How both aspects are elegantly intertwined in order to achieve a viable life cycle.
Europeans, Americans and scientists from other countries are well represented in FIS. We have a remarkable representation of Chinese intellectuals and scientists, who are very involved in information science and who are doing interesting philosophical research as well as introducing information science into their educational and research systems.
One of the missions of FIS is organizing a sound body of new thinking about the informational cohesion of the physical, biological, and social realms. As a basis, a new vision of biological information is needed -- that's a personal concern of mine.
Communicative cells, and the cell cycle, are central to this. The living cell in an organism doesn't know what to do. It needs some specific signals from the environment to advance in particular directions, even to continue with the "inertia" of its own cycle. So, the cell in the multicellular system scans multiple environmental cues to be told what to do. "What should I do with my life?" -- asks the cell.
"Oh, you should stop growing, says the environment. Oh, you should reproduce faster. Oh, you should differentiate. Oh, you should kill yourself."
The cell continuously takes advice from the surrounding environment on what to do next, via its enormous multiplicity of signaling pathways. Like us via our own senses, and with all our conversation exchanges and social acquaintances around. . . .
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The FDA has approved field trials of a genetically engineered mosquito designed to combat Zika and other diseases. But there's strong opposition in Florida where the GMO insects would be tested.
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A runaway trolley is careening down the street, heading toward a group of pedestrians who are milling about on the tracks. The trolley's conductor is limited in her ability to mitigate the damage; she can allow the trolley to continue on its course, hitting the crowd and causing injury to many people, or she can flip a switch, directing the trolley down an alternate route where the tracks are blocked by a lone child, who will certainly die from the collision.
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