How Biology WorksThe mysteries of life, from DNA and cells to evolution and ecology, all explained with simple words and clever graphics. The simplest, most visual guide to the science of life ever. How do vaccines work? What is special about stem cells? How did we evolve from bacteria? The science of life can be dauntingly complex, and it can be hard to separate good science from bad, fundamental truths from the much hyped breakthroughs reported in the media. With