kate wong a senior editor at "scientific american." she has been writing about the evolution of humans and other organisms for the magazine since 1997. she is also co-author with donald johansson of loose his legacy, the quest for human origins. tonight there will be discussing this new book "first steps: how upright walking made us human." in it he explores the history of the ability unique to humans among living mammals to walk on two legs. he makes the case bipedalism was a crucial change that allowed for the evolution of humans despite the difficulties that pose to -- publishers weekly prices his love of fossil discovery and a collaborating with colleagues come through in the oney experiences in t examig bones firsthand because to turn anatomical evidence into a focused tale of human evolution and his enthusiasm for research will leave readers both informed and uplifted. i am so pleased to turn things over to our speakers. the digital podium is yours, jeremy and kate. >> thank thank you, nell. i appreciate introduction. thanks for