Amazon.com description: Product Description: Not only is matter constantly changing - or morphing - but it was created at the beginning of the universe and will cease to exist only when our universe does. In this work, Lawrence M. Krauss describes the journey of a single oxygen atom throughout our universe. Starting with its emergence at the Big Bang, Krauss shows how atoms were then forged in the nuclear furnaces of stars. From there, we follow the atom as it travels across the Milky Way, and finally arrives on Earth, where it finds itself located in a drop of water.