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See video Hexaflexagons

How to create hexaflexagons.

51669 3.88
See video Size of the planets and stars

The size of the planets Mercury, Mars, Venus, Earth, Neptune, Saturn, Jupiter, Sun, Sirius A, Pollux, Arcturus, Aldebaran, Rigel and more.

894 3.43
See video Obama Speech: 'A More Perfect Union'

In the course of the contest for the 2008 Democratic Party presidential nomination, Obama gives this speech to address racial tensions, white privilege, and race and inequality in the United States.

4077 5.37
See video Arithmetic, Population, and Energy Part 2 of 8

Most people do not understand exponential growth, yet the concept is of fundamental importance. Lecture by Dr. Albert A. Bartlett, professor emeritus of Physics at the University of Colorado-Boulder.

523 5.53
See video Does the Universe Have a Purpose? feat. Neil deGrasse Tyson

If the purpose of the universe was to create humnans, then the cosmos was embarrassingly inefficient about it. We have only been around for the blink of an eye in the history of the universe.

37150 5.54
See video 2008 Vice Presidential Debate with Gov. Palin and Sen. Biden (Full Video)

The full 1,5 hour debate between Vice Presidential Candidates Governor Sarah Palin and Senator Joe Biden.

1377 5.02
See video The Physics of Watchmen

Prof. James Kakalios added a physics perspective to the movie Watchmen, and explains the quantum mechanics behind the superpowers of Dr. Manhattan. Prof. Kakalios is an expert on the physics of superheroes

1270 4.96
See video Van Gogh Self Portraits

Self-portrait paintings of van Gogh, by Philip Scott Johnson

510 5.69
See video First 2008 Presidential Debate - McCain and Obama (Full Video)

McCain and Obama debate on issues such as goverment spending, the $700 billion bailout proposal, Iran, Iraq and relations with Russia.

1131 5.13
See video Lions vs Hyena

Two male lions kill a hyena, but the task is not easy. This video demonstrates how tough hyenas are.

3160 3.61
See video Drinking coffee in space

Dr. Don Pettit demonstrates a zero-gravity coffee cup aboard the International Space Station.

1256 5.82
See video Ken Robinson - Changing Education Paradigms

Excellent animation adapted from Sir Ken Robinson's talk at RSA.

11475 6.31