There are very few things that really stop me in my tracks and I can watch and listen to for hours on end without ever getting tired - one of these things is anything Space and Cosmos. I could live on Nasa.tv and steamed broccoli. Neil deGrasse Tyson, an astrophysicist and Director of the Hayden Planetarium at the American Museum of Natural History, talks about Newton and the importance of keeping the lines of thought and conversation open. He says when open conversation ratchets up - you make discoveries and you make discoveries rapidly..