DNA, the genetic blueprint of all creatures, is a stunningly rich and detailed record of evolution. Every change or new trait, from the gaudy colors of tropical birds to our color vision with which we admire them, is due to changes in DNA that leave a record and can be traced. Just as importantly, the DNA evidence has revealed several profound surprises about how evolution actually works.
Sean B. Carroll is professor of genetics at the University of Wisconsin-Madison and investigator at the Howard Hughes Medical Institute. His first book, Endless Forms Most Beautiful, was a finalist for the 2005 Los Angeles Times Book Prize. Carroll's seminal scientific work has been featured in Time and The New Yorker. He lives in Madison, Wisconsin.