Learn how our bone density has changed over human history as our lifestyles have become less physically demanding.
12/15/16 | 3:24
6/7/17 | 5:00
8/29/17 | 5:31
5/23/17 | 4:56
3/3/17 | 4:22
2/15/17 | 5:19
5/22/17 | 5:27
