Book excerpt: In Can Crocodiles Cry? Paul Heiney unravels further science behind those things we take for granted, and explains just why the world and its contents are the way they are. Drawing on questions asked by the public, this book brings some of the finest scientific minds to bear on how the laws of science apply to everyday life.It is the perfect present for the insatiably curious, provocative poseurs, quizaholics and science addicts everywhere.