Free biology talks by the world's leading scientists. Our mission is to produce a library of outstanding science lectures. We will add 15-20 seminars per year in a wide-range of biology topics. Access, through web streaming or download, is completely free-of-charge. Also check out our iBioMagazine channel, where you can watch ~10 minute talks about the human-side of science.

John Edmark's sculptures are both mesmerizing and mathematical. Using meticulously crafted platforms, patterns, and layers, Edmark's art explores the seemingly magical properties that are present in spiral geometries. In his most recent body of work, Edmark creates a series of animating “blooms” that endlessly unfold and animate as they spin beneath a strobe light.

Neil deGrasse Tyson and panelists discuss de-extinction in the 2017 Isaac Asimov Memorial Debate at the American Museum of Natural History. Biologists today have the knowledge, the tools, and the ability to influence the evolution of life on Earth. Do we have an obligation to bring back species that human activities may have rendered extinct? Does the technology exist to do so? Join Tyson and the panel for a lively debate about the merits and shortcomings of this provocative idea.

2017 Asimov Debate panelists are:

George Church Professor of Health Sciences and Technology, Harvard University and MIT

Hank Greely Director of the Center for Law and the Biosciences, Stanford University

Gregory Kaebnick Scholar, The Hastings Center; Editor, Hastings Center Report

Ross MacPhee Curator, Department of Mammalogy, Division of Vertebrate Zoology; Professor, Richard Gilder Graduate School

Beth Shapiro Professor of Ecology and Evolutionary Biology, University of California, Santa Cruz

From Jos Leys, Étienne Ghys and Aurélien Alvarez, the makers of Dimensions, comes CHAOS. It is a film about dynamical systems, the butterfly effect and chaos theory, intended for a wide audience.

How do you stack hundred-dimensional oranges? Learn about recent breakthroughs in our understanding of hyperspheres in the first episode of Infinite Series, a show that tackles the mysteries and the joy of mathematics. From Logic to Calculus, from Probability to Projective Geometry, Infinite Series both entertains and challenges its viewers to take their math game to the next level.

Higher dimensional spheres, or hyperspheres, are counter-intuitive and almost impossible to visualize. Mathematician Kelsey Houston-Edwards explains higher dimensional spheres and how recent revelations in sphere packing have exposed truths about 8 and 24 dimensions that we don't even understand in 4 dimensions.

Emmy Noether made one the most significant discovery of the 20th century. As female Jewish intellectual in Nazi Germany, Emmy's had a special approach to life. Noether's Theorem ties the laws of nature -- from Newton's laws to thermodynamics to charge conservation -- directly to the geometry of space and time, the very fabric of reality. It is the basis for the standard model of particle physics, quantum electrodynamics, and grand unified theories including supersymmetry and superstrings. As usual in physics, it gets really interesting when the theorem is violated: answers to the origin of mass and the matter-antimatter asymmetry problems emerge when Noether's theorem is violated. Two things should bother you about Noether's Theorem: (1) how come so few people have heard of Emmy Noether? and (2) why isn't her theorem well known to lovers of science? With the help of a bunch of straw, Ransom Stephens solves these problems on June 16, 2010.

Of all of the known subatomic forces, the weak force is in many ways unique. One particularly interesting facet is that the force differentiates between a particle that is rotating clockwise and counterclockwise. In this video, Fermilab’s Dr. Don Lincoln describes this unusual property and introduces some of the historical figures who played a role in working it all out.

According to our best theories of physics, the fundamental building blocks of matter are not particles, but continuous fluid-like substances known as 'quantum fields'. David Tong explains what we know about these fields, and how they fit into our understanding of the Universe.

At the heart of the Milky Way, there's a supermassive black hole that feeds off a spinning disk of hot gas, sucking up anything that ventures too close -- even light. We can't see it, but its event horizon casts a shadow, and an image of that shadow could help answer some important questions about the universe.

Scientists used to think that making such an image would require a telescope the size of Earth -- until Katie Bouman and a team of astronomers came up with a clever alternative. Katie explains how we can take a picture of the ultimate dark using the Event Horizon Telescope.

It is possible to turn a sphere inside out in 3-space with possible self-intersections but without creating any crease, a process often called sphere eversion (eversion means "to turn inside out").

Andreas Dewes explains why quantum computing is interesting, how it works and what you actually need to build a working quantum computer. He uses the superconducting two-qubit quantum processor which he built during his PhD thesis as an example to explain its basic building blocks. He shows how this processor can be used to achieve so-called quantum speed-up for a search algorithm that can be run on it. Finally, he gives a short overview of the current state of superconducting quantum computing and Google's recently announced effort to build a working quantum computer in cooperation with one of the leading research groups in this field.

Google recently announced that it is partnering up with John Martinis - one of the leading researchers on superconducting quantum computing - to build a working quantum processor. This announcement has sparked a lot of renewed interest in a topic that was mainly of academic interest before. So, if Google thinks it's worth the hassle to build quantum computers then there surely must be something about them after all?

In this video the Mathologer gives an introduction to the notoriously hard topic of transcendental numbers that is both in depth and accessible to anybody with a bit of common sense. Find out how Georg Cantor's infinities can be used in a very simple and off the beaten track way to pinpoint a transcendental number and to show that it is really transcendental. Also find out why there are a lot more transcendental numbers than numbers that we usually think of as numbers, and this despite the fact that it is super tough to show the transcendence of any number of interest such as pi or e. Also featuring an animated introduction to countable and uncountable infinities, Joseph Liouville's ocean of zeros constant, and much more.

Here is a link to one of Georg Cantor's first papers on his theory of infinite sets. Interestingly it deals with the construction of transcendental numbers!

Cantor, Georg (1874), "Ueber eine Eigenschaft des Inbegriffes aller reellen algebraischen Zahlen", Journal für die Reine und Angewandte Mathematik, 77: 258–262 http://gdz.sub.uni-goettingen.de/pdfc...

Here is the link to the free course on measure theory by my friend Marty Ross who I also like to thank for his help with finetuning this video: http://maths.org.au/index.php/2013/10... (it's the last collection of videos at the bottom of the linked page).

Thank you also very much to Danil Dmitriev the official Mathologer translator for Russian for his subtitles.

Adiabatic quantum computation (AQC) is a form of quantum computing which relies on the adiabatic theorem to do calculations[1] and is closely related to, and may be regarded as a subclass of, quantum annealing. First, a (potentially complicated) Hamiltonian is found whose ground state describes the solution to the problem of interest. Next, a system with a simple Hamiltonian is prepared and initialized to the ground state. Finally, the simple Hamiltonian is adiabatically evolved to the desired complicated Hamiltonian. By the adiabatic theorem, the system remains in the ground state, so at the end the state of the system describes the solution to the problem. Adiabatic Quantum Computing has been shown to be polynomially equivalent to conventional quantum computing in the circuit model.[6] The time complexity for an adiabatic algorithm is the time taken to complete the adiabatic evolution which is dependent on the gap in the energy eigenvalues (spectral gap) of the Hamiltonian. Specifically, if the system is to be kept in the ground state, the energy gap between the ground H(t) state and the first excited state of {\displaystyle H(t)} provides an upper bound on the rate at which the t Hamiltonian can be evolved at time {\displaystyle t}.[7

Dr. Rainer Weiss, emeritus professor of Physics from MIT, speaks to the University of Washington community on "Gravitational Wave Astronomy: A New Way.

Prof. Weiss is an Americanphysicist, known for his contributions in gravitational physics and astrophysics. He is a professor of physics emeritus at MIT. He is best known for inventing the laser interferometric technique which is the basic operation of LIGO. Rainer Weiss was Chair of the COBE Science Working Group.[1][2][3].

Dr. Weiss brought two fields of fundamental physics research from birth to maturity: characterization of the cosmic background radiation,[3] and interferometric gravitational wave observation. He made pioneering measurements of the spectrum of the cosmic microwave background radiation, and then was co-founder and science advisor of the NASA COBE (microwave background) satellite.[1] In 2006, with John C. Mather, he and the COBE team received the Gruber Prize in Cosmology.[2]

Weiss also invented the interferometric gravitational wave detector, and co-founded the NSF LIGO (gravitational-wave detection) project. Both of these efforts couple challenges in instrument science with physics important to the understanding of the Universe.[7] In 2007, with Ronald Drever, he was awarded the Einstein Prize for this work.[8]

Mathematics has proven to be "unreasonably effective" in understanding nature. The fundamental laws of physics can be captured in beautiful formulae. In this lecture, Prof. Robbert Dijkgraaf argues for the reverse effect: Nature is an important source of inspiration for mathematics, even of the purest kind. In recent years ideas from quantum field theory, elementary particles physics and string theory have completely transformed mathematics, leading to solutions of deep problems, suggesting new invariants in geometry and topology, and, perhaps most importantly, putting modern mathematical ideas in a `natural’ context.

The coelacanths constitute a now rare order of fish that includes two extant species in the genus Latimeria: the West Indian Ocean coelacanth (Latimeria chalumnae) and the Indonesian coelacanth (Latimeria menadoensis). They follow the oldest known living lineage of Sarcopterygii (lobe-finned fish and tetrapods), which means they are more closely related to lungfish, reptiles and mammals than to the common ray-finned fishes. They are found along the coastlines of the Indian Ocean and Indonesia. Since there are only two species of coelacanth and both are threatened, it is the most endangered order of animals in the world. The West Indian Ocean coelacanth is a critically endangered species.

The coelacanth, which is related to lungfishes and tetrapods, was believed to have been extinct since the end of the Cretaceous period. More closely related to tetrapods than to the ray-finned fish, coelacanths were considered transitional species between fish and tetrapods. On 23 December 1938, the first Latimeria specimen was found off the east coast of South Africa, off the Chalumna River (now Tyolomnqa). Museum curator Marjorie Courtenay-Latimer discovered the fish among the catch of a local angler, Captain Hendrick Goosen. A Rhodes University ichthyologist, J. L. B. Smith, confirmed the fish's importance with a famous cable: "MOST IMPORTANT PRESERVE SKELETON AND GILLS = FISH DESCRIBED".[6][14]

The coelacanth has no real commercial value apart from being coveted by museums and private collectors. As a food fish it is almost worthless, as its tissues exude oils that give the flesh a foul flavor.[18] The coelacanth's continued survival may be threatened by commercial deep-sea trawling,[19] in which coelacanths are caught as bycatch.

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