4 years ago
This lecture is a MUST (viewed more than 7 million times since May 2011). Prof. Lewin puts his life on the line to demonstrate that he is a strong believer in the conservation of energy. He explained why the sky is blue, why the clouds are white and why sunsets are red. The demonstrations are fascinating. MIT video streamed this lecture in real time. It was viewed live by about 25 thousand people all over the world.