Robert Sapolsky: Toxoplasmosis
Robert Sapolsky lectures about what he considered the most bizarre parasite.
There is another video of Robert Sapolsky talking about Toxoplasmosis with better quality (Thanks to Andy for the link)
Albert Einstein: The common language of science
Albert Einstein’s speech, broadcasted on September 28, 1941, addressed the meeting of the British Association for the Advancement of Science.
Simon Singh: How Enigma works
Simon Singh demonstrates the basic principles of the encryption machine Enigma.
Sheena Iyengar: The art of choosing
In this great TED talk Sheena Iyengar talks about her research about choice and the cultural differences.