Andrew Lawler is author of the best­selling The Secret Token and the acclaimed Why Did the Chick­en Cross the World?. His work has appeared in The New York Times, Wash­ing­ton Post, Nation­al Geo­graph­ic, Smith­son­ian, and Best of Sci­ence and Nature Writ­ing. He is a con­tribut­ing writer for Sci­ence and a con­tribut­ing edi­tor for Archae­ol­o­gy.