In this video lecture, Prof. Wei Shun from Tsinghua university talks about the various aspects of 3D bioprinting. What is 3D bioprinting and how it can be used for regenerative medicine and for the formation of 3D tissue models to study disease mechanisms in the lab.
The lecture was given in Tel-Aviv University 2014.
Can current theories of cosmology explain how the Universe evolved? One way to find out is to plug everything we think we know about the early Universe and how galaxies form into a supercomputer, and see what comes out. In a simulation presented today in Nature1, researchers did just that — and revealed a cosmos that looks rather like our own. The findings lend weight to the standard model of cosmology, but could also help physicists to probe where our models of galaxy formation fall down.
Scientists at MIT have traced 13 billion years of galaxy evolution, from shortly after the Big Bang to the present day. Their simulation, named Illustris, captures both the massive scale of the Universe and the intriguing variety of galaxies -- something previous modelers have struggled to do. It produces a Universe that looks remarkably similar to what we see through our telescopes, giving us greater confidence in our understanding of the Universe, from the laws of physics to our theories about galaxy formation.
The recent resurrection of multi-layer neural networks is generating a lot of interest currently, with deep learning appearing on the New York Times front page, and big companies like Google and Facebook hunting for the experts in this field. Jürgen Schmidhuber, Director of the Swiss AI Lab IDSIAs, will shed more light on how deep learning methods work, and why they work.
The behavior of an animal reflects computations across its entire nervous system, involving the coordinated activity of thousands of neurons within and across multiple brain areas. New technologies for imaging the nervous system allow us to monitor neural function at unprecedented scales. But the data sets are quickly outpacing the capabilities of ordinary analytical approaches. They are large (one terabyte or more per hour), complex, and high-dimensional, and we want to understand their structure as it evolves over both space and time.
How billions of interconnected cells in the brain can interpret and regulate all our bodily functions as well as mediate our experiences of interactions with and responses to the world around us is a huge and fascinating question that many different disciplines have attempted to tackle. This lecture considers what we have learned so far about the principles of neural encoding and how they may begin to explain our memories, emotions and conscious awareness.
Gresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. (http://www.gresham.ac.uk)
At the Biz Barcelona 2013 conference, Singularity University's Salim Ismail outlined how exponential technology is increasingly impacting our lives. From computer technology to the demise of nation states, including the United States, Ismail shows just how powerful this phenomenon is.
Often called a living fossil, the coelacanth was long believed to have fallen extinct 70 million years ago, until a specimen was recognized in a fish market in South Africa in 1938. The coelacanth has fleshy, lobed fins that look somewhat like limbs, as does the lungfish, an air-breathing freshwater fish.
The coelacanth and the lungfish have long been battling for the honor of which is closer to the ancestral fish that first used fins to walk on land and give rise to the tetrapods, meaning all the original vertebrates and their descendants, from reptiles and birds to mammals.
The decoding of the coelacanth genome results in a victory for the lungfish as the closer relative to the first tetrapod. But the coelacanth may have the last laugh because its genome — which, at 2.8 billion bp of DNA, about the same size as a human genome — is decodable, whereas the lungfish genome, a remarkable 100 billion DNA units in length, cannot be cracked with present methods. The coelacanth genome is therefore more likely to shed light on the central evolutionary question of what genetic alterations were needed to change a lobe-finned fish into the first land-dwelling tetrapod.
The idea of decoding the coelacanth genome began six years ago when Chris Amemiya, a biologist at the University of Washington in Seattle, acquired some samples of coelacanth tissue. He asked the Broad Institute of Harvard and M.I.T., a biological research institute in Cambridge, Mass., to decode the DNA and invited experts in evolutionary and developmental biology to help interpret the results.
Dr. Amemiya’s team has sifted through the coelacanth’s genome for genes that might have helped its cousin species, the ancestor to the first tetrapod, invade dry land some 400 million years ago. They have found one gene that is related to those that, in animal species, build the placenta. Coelacanths have no placenta, but they produce extremely large eggs, with a good blood supply, that hatch inside the mother’s body. This gene could have been developed by land animals into a way of constructing the placenta.
Another helpful preadaptation is a snippet of DNA that enhances the activity of the genes that drive the formation of limbs in the embryo. The Amemiya team focused on the enhancer DNA sequence because it occurred in the coelacanth and animals but not in ordinary fish. They then inserted the coelacanth enhancer DNA into mice.
“It lit up right away and made an almost normal limb,” said Neil Shubin, meaning that the coelacanth gene enhancer successfully encouraged the mouse genes to make a limb. Dr. Shubin, a member of the team, is a paleontologist at the University of Chicago.
Present-day coelacanths are ferocious predators that live in a twilight zone about 500 feet deep where light barely penetrates. They lurk in caves during the day and emerge at night to attack surface fish as they descend and deep-sea fish as they rise to the surface. They have no evident need of fins that might help them walk on land.
“This is probably an unusual habitat for this lineage,” said Axel Meyer, an evolutionary biologist at the University of Konstanz in Germany and a member of the team. “Other coelacanths lived in more shallow, estuarylike environments 400 million years ago, and you can envisage them using the fins more like walking legs.”
The Amemiya team reports evidence that the coelacanth’s genes have been evolving more slowly than those of mammals, possibly because of “a static habitat and lack of predators.” But its environment must have changed quite considerably over the last 400 million years, Dr. Meyer said. Its principal habitat at present is the caves beneath the Comoro Islands in the Indian Ocean, but since these are extinct volcanoes a mere 5 million to 10 million years old, they must be a quite recent home for the coelacanth.
The Amemiya team does not possess a full coelacanth — these are endangered species — and decoded the genome from tissues obtained from Rosemary Dorrington of Rhodes University in South Africa. Dr. Dorrington supplied DNA kits to the Comoro Islands fishermen who occasionally snag coelacanths by accident. When a coelacanth was captured in 2003, they preserved blood and tissues, which were given to Dr. Dorrington and kept frozen, Dr. Amemiya said.
The specimen was preserved in Moroni, the capital of the Comoro Islands, but Dr. Amemiya has been unable to find out where it is now because of the constant state of civil war in the islands, he said.
Can he be certain, then, that the tissue came from a coelacanth? “Oh, no question,” Dr. Amemiya said. “We have DNA from several other coelacanths, from Africa and Indonesia, which is very similar to this one.” The one caught in 2003 was identified as a coelacanth by Said Ahamada, a South African expert, Dr. Amemiya said.
Because the original specimen is not available and the DNA sequencing is incomplete, the Amemiya team does not know its sex.
In this 2013 video by Science Friday, researchers take advantage of the Leidenfrost effect to make droplets of water flow up an incline. The Leidenfrost effect occurs when a liquid is placed on a surface that is significantly hotter than the liquid’s boiling point. A layer of vapor prevents the liquid from touching the surface and thus boiling rapidly away—the vapor also allows the liquid to move across the surface with ease.
Machine learning algorithms find patterns in big data sets. This talk presents quantum machine learning algorithms that give exponential speed-ups over their best existing classical counterparts. The algorithms work by mapping the data set into a quantum state (big quantum data) that contains the data in quantum superposition. Quantum coherence is then used to reveal patterns in the data. The quantum algorithms scale as the logarithm of the size of the database.
Seth Lloyd visited the Quantum AI Lab at Google LA to give a tech talk on "Quantum Machine Learning." This talk took place on January 29, 2014.
Time. We waste it, save it, kill it, make it. The world runs on it. Yet ask physicists what time actually is, and the answer might shock you: They have no idea. Even more surprising, the deep sense we have of time passing from present to past may be nothing more than an illusion. How can our understanding of something so familiar be so wrong? In search of answers, Brian Greene takes us on the ultimate time-traveling adventure, hurtling 50 years into the future before stepping into a wormhole to travel back to the past. Along the way, he will reveal a new way of thinking about time in which moments past, present, and future—from the reign of T. rex to the birth of your great-great-grandchildren—exist all at once. This journey will bring us all the way back to the Big Bang, where physicists think the ultimate secrets of time may be hidden. You'll never look at your wristwatch the same way again.
Michio Kaku (born January 24, 1947) is an American theoretical physicist, the Henry Semat Professor of Theoretical Physics at the City College of New York, a futurist, and a communicator and popularizer of science. He has written several books about physics and related topics; he has made frequent appearances on radio, television, and film; and he writes extensive online blogs and articles. He has written two New York Times Best Sellers, Physics of the Impossible (2008) and Physics of the Future (2011).
Kaku has hosted several TV specials for the BBC, the Discovery Channel, the History Channel, and the Science Channel.
Kaku has appeared in many forms of media and on many programs and networks, including Good Morning America, The Screen Savers, Larry King Live, 60 Minutes, Imus In The Morning, Nightline, 20/20, Naked Science, CNN, ABC News, CBS News, NBC News, Al Jazeera English, Fox News Channel, The History Channel, Conan, The Science Channel, The Discovery Channel, TLC, Countdown with Keith Olbermann, The Colbert Report, The Art Bell Show and its successor, Coast To Coast AM, BBC World News America, The Covino & Rich Show, Head Rush, Late Show with David Letterman, and Real Time with Bill Maher. Kaku was interviewed for two PBS documentaries produced and directed by Rosemarie Reed, a former colleague of his at WBAI Radio, The Path to Nuclear Fission: The Story of Lise Meitner and Otto Hahn and Out from the Shadows: The Story of Irène Joliot-Curie and Frédéric Joliot-Curie. We Are the Guinea Pigs (1980) Borders (1989) Synthetic Pleasures (1995) Einstein Revealed (1996) Future Fantastic (1996) Stephen Hawking's Universe (1997) Bioperfection: Building a New Human Race (1998) Exodus Earth (1999) Me & Isaac Newton (1999) Space: The Final Junkyard (1999) Ghosts: Caught on Tape (2000) Big Questions (2001) Parallel Universes (2001) Horizon: "Time travel" (2003) Robo sapiens (2003) Brilliant Minds: Secret Of The Cosmos (2003) Nova: "The Elegant Universe" (2003) Hawking (2004) The Screen Savers (2004) Unscrewed with Martin Sargent (2004) Alien Planet (2005) ABC News "UFOs: Seeing Is Believing" (2005) HARDtalk Extra (2005) Last Days on Earth (2005) Obsessed & Scientific (2005) Horizon: "Einstein's Unfinished Symphony" (2005) Time (2006) 2057 (2007) The Universe (2007) Futurecar (2007) Attack of the Show! (2007) Visions of the Future (2008) Horizon: "The President's Guide to Science" (2008) Stephen Hawking: Master of the Universe (2008) Horizon: "Who's Afraid of a Big Black Hole" (2009--2010) Sci Fi Science: Physics of the Impossible (2009--2010) Horizon: "What Happened Before the Big Bang?" (2010) GameTrailers TV With Geoff Keighley: "The Science of Games" (2010) How the Universe Works (2010) Seeing Black Holes (2010) Prophets of Science Fiction (2011) Through the Wormhole (2011) Horizon: "What Happened Before the Big Bang?" (2011) The Science of Doctor Who (2012) World War Z: (2013)
Wolfram Research | Stephen Wolfram, PhD, introduces the Wolfram Language in this video and demonstrates how the symbolic programming language enables functional programming, querying of large databases, flexible interactivity, and easy deployment.
Wikipedia | Wolfram Language is a highly general, multi-paradigm programming language developed by Wolfram Research, that serves as the main interfacing language for Wolfram Mathematica.
It is designed with emphasis on symbolic computation, functional programming, and rule-based programming. It is built to represent arbitrary structures and data.
The language is very large, touching on numerous domains, often specialized. For example, it includes built-in functions for generating and running Turing machines, creating graphics and audio, analyzing 3D models, and solving differential equations.
It is planned to be bundled with the system software installed on every Raspberry Pi. Intel Edison also integrates the language, and it is planned to be integrated in the Unity game engine.
In this fascinating interview, physicist Tom Campbell, formerly with and now a consultant for NASA, discusses the current problems facing the scientific community's search for a Grand Unified Theory of Everything. String theory, holography, zero-point field theory, and other vogue models have failed to produce any significant results other than speculation, conjecture, and contradiction-hampered popular films such as 'What the Bleep Do We Know?' While Campbell doesn't merely criticize these theories, he offers a fresh interpretation of the root of the problem: the Double Slit Experiment.
Campbell also discusses information theory, virtual reality, process fractals, the quantum erasure experiments, video games, and the unavoidably primary role of conscious observers within our reality.
Through what he calls the data base, he also discusses accessing the Larger Consciousness System. Yes, His Big TOE derives a Supreme Being.
Tom has excelled as a working scientist, a professional physicist dedicated to pushing back the frontiers of cutting edge technology, large-system simulation, technology development and integration, and complex system vulnerability and risk analysis.
Michio Kaku discovers our sense of time passing and the clocks that drive our bodies. He reveals the forces of time that make and destroy us in a lifetime. He journeys to some of the Earth's most spectacular geological sites to look for clues to the extraordinary depths of time at a planetary level. Finally, he takes us on a cosmic journey in search of the beginning (and the end) of time itself.
Part 1: Daytime Time seems to drive every moment. It's the most inescapable force we feel. But do we experience time from within our minds and bodies or from the outside?
Part 2: Lifetime The most powerful effect of time on our lives is the way it limits us. Our knowledge of death is so embedded in our lives and spirituality that, were immortality possible, would we lose the sense that makes us human?
Part 3: Earthtime The most powerful effect of time on our lives is the way it limits us. Our knowledge of death is so embedded in our lives and spirituality that, were immortality possible, would we lose the sense that makes us human?
Part 4: Cosmic Time We've always structured our lives based on an unchanging past and a predictable and ordered future. But atomic and cosmic discoveries have changed all that. What is time itself? And will it ever end?
Documentaries have an incredible ability to educate and motivate people to care about the world around them. We need more people to be part of the solution by tackling the most critical issues facing the planet. Check out my list of favorite documentaries of 2013. Share your favorites documentaries in the comment area below.
Dr. Batalha (Mission Scientist for the Kepler Mission, searching for exoplanets) describes the techniques used by the Kepler team to identify planets orbiting other stars and updates us on the remarkable progress they are making in the search for Earth-sized worlds. She discusses the planets already found and shares what we know so far about the thousands of candidate planets that are in the Kepler data.
Dr. Michio Kaku is a theoretical physicist and the Henry Semat Professor at the City College of New York and the Graduate Center of the City University of New York, where he has taught for more than 30 years. He is a graduate of Harvard University in Cambridge, Massachusetts, and earned his doctorate from the University of California at Berkeley.
Dr. Kaku is one of the founders of string field theory, a field of research within string theory. String theory seeks to provide a unified description for all matter and the fundamental forces of the universe.
His book The Physics of the Impossible addresses how science fiction technology may become possible in the future. His other books include Hyperspace: A Scientific Odyssey Through Parallel Universes, Time Warps, and the Tenth Dimension , selected as one of the best science books of 1994 by both the New York Times and The Washington Post, and Parallel Worlds: A Journey Through Creation, Higher Dimensions, and the Future of the Cosmos , a finalist for the Samuel Johnson Prize.
Part 1 --------- Where did we come from? What makes us human? An explosion of recent discoveries sheds light on these questions, and NOVA's comprehensive, three-part special, "Becoming Human," examines what the latest scientific research reveals about our hominid relatives.
Part 1, "First Steps," examines the factors that caused us to split from the other great apes. The program explores the fossil of "Selam," also known as "Lucy's Child." Paleoanthropologist Zeray Alemseged spent five years carefully excavating the sandstone-embedded fossil. NOVA's cameras are there to capture the unveiling of the face, spine, and shoulder blades of this 3.3 million-year-old fossil child. And NOVA takes viewers "inside the skull" to show how our ancestors' brains had begun to change from those of the apes.
Why did leaps in human evolution take place? "First Steps" explores a provocative "big idea" that sharp swings of climate were a key factor.
Part 2 --------- In "Birth of Humanity," the second part of the three-part series "Becoming Human," NOVA investigates the first skeleton that really looks like us--"Turkana Boy"--an astonishingly complete specimen of Homo erectus found by the famous Leakey team in Kenya. These early humans are thought to have developed key innovations that helped them thrive, including hunting large prey, the use of fire, and extensive social bonds.
The program examines an intriguing theory that long-distance running--our ability to jog--was crucial for the survival of these early hominids. Not only did running help them escape from vicious predators roaming the grasslands, but it also gave them a unique hunting strategy: chasing down prey animals such as deer and antelope to the point of exhaustion. "Birth of Humanity" also probes how, why, and when humans' uniquely long period of childhood and parenting began.
Part 3 --------- In "Last Human Standing," the final program of the three-part series "Becoming Human," NOVA examines the fate of the Neanderthals, our European cousins who died out as modern humans spread from Africa into Europe during the Ice Age. Did modern humans interbreed with Neanderthals or exterminate them? The program explores crucial evidence from the recent decoding of the Neanderthal genome.
How did modern humans take over the world? New evidence suggests that they left Africa and colonized the rest of the globe far earlier, and for different reasons, than previously thought. As for Homo sapiens, we have planet Earth to ourselves today, but that's a very recent and unusual situation. For millions of years, many kinds of hominids co-existed. At one time Homo sapiens shared the planet with Neanderthals, Homo erectus, and the mysterious "Hobbits"--three-foot-high humans who thrived on the Indonesian island of Flores until as recently as 12,000 years ago.
"Last Human Standing" examines why "we" survived while those other ancestral cousins died out. And it explores the provocative question: In what ways are we still evolving today?
This Perspective discusses how gels and aerogels manufactured from a variety of metal and semiconductor nanoparticles available in colloidal solutions have recently proven to provide an opportunity to marry the nanoscale world with that of materials of macro dimensions that can be easily manipulated and processed while maintaining the nanoscale properties. The aerogel materials may be further processed in order to achieve improvements in their properties relevant to applications in optical sensing, photovoltaics, LEDs, nonlinear optics, thermoelectrics, and catalysis. This Perspective reviews the young field, lines out some of the synthetical challenges, and touches on application-related aspects.