New footage of the 1986 Challenger disaster has emerged. It captures the reaction of a crowd at the moment the shuttle exploded over Cape Canaveral. The video is the latest amateur footage of the Challenger disaster that has attracted attention.
Bill Gates became hooked on the work of Nobel physicist Richard P. Feynman 20 years ago and wanted to bring his work to a wider audience. Now you can watch the lectures given by Feynman, the bongo-playing-artist- physicist online for free.