Book excerpt: Dr Francis S. Collins, head of the Human Genome Project, is one of the world's leading scientists, working at the cutting edge of the study of DNA, the code of life. Yet he is also a man of unshakable faith in God. How does he reconcile the seemingly unreconcilable? In THE LANGUAGE OF GOD he explains his own journey from atheism to faith, and then takes the reader on a stunning tour of modern science to show that physics, chemistry and biology -- indeed, reason itself -- are not incompatible with belief. His book is essential reading for anyone who wonders about the deepest questions of all: why are we here? How did we get here? And what does life mean?