The Scientists are In: Dr. Rachel Jacobs and Elaine Guevara July 6, 2016 1:00PM - 3:00PM Not Free; Location: Hall of Human Origins, National Museum of Natural History Dr. Rachel Jacobs and Elaine Guevara from the Center for the Advanced Study of Human Paleobiology at George Washington University will be in the exhibit with touchable objects to answer questions and talk about their research.