Professor Paul Davies, science writer, author of 25 books, talks about many of the topics covered in his books, such as life on other planets, intelligent life in the universe, exobiology, time machines, advanced civilizations, and black holes. Also: Will the weather get worse? More monster hurricanes?; Bio-engineered grass often used in golf courses can spread 15 miles from original test site; Are we running out of gas? Scientist says oil production will decline; Can we live longer by changing our diet?; Scientists have grown retinal cells for the eye from stem cells.