Now playing: "The Grandmother Hypothesis and Rates of Aging" from Apr 13, 2012.
Click on the corner of the video for closed captioning [CC], to adjust the video quality, or to expand the video to full screen. Email firstname.lastname@example.org with any problems viewing this video.
If you enjoyed this video and wish to support CARTA, please consider making a . You may also be interested in accessing additional content and services of interest to you. Just Create a New Account if you do not already have one, or Login if you already have an account.