According to Genesis, 'First there was light.'. According to scientists, this initial light is still about us, shining down from the heavens. Not only does it shine, it's red-shifted, and, depending on its composition, it indicates whether the universe is static, expanding or contracting. All we need do is detect this light to learn about our origin. This is the story in Michael Lemonick's book Echo of the Big Bang. In particular, he tells the tale of the Wilkinson Microwave Anisotropy Probe (WMAP), its place in remote sensing and its role in cosmology. From it, we learn a little more about the first light and we know it is good.