This Holy Week, Christians worldwide are celebrating the life, death, and resurrection of Jesus Christ, whom they believe is fully man and fully God. It's a conviction that appears to flout logic but, amazingly, is wholly in line with the revelations of modern science. Scientists used to believe that waves and particles were opposite phenomena, each obeying a different set of rules. A stone, for instance, is particle-like; its shape and size remain the same whether it exists in outer space, water, or molasses. By contrast, ripples are wave-like; their shape and size depend critically on the medium through which they move.