Learn how our bone density has changed over human history as our lifestyles have become less physically demanding.
5/9/17 | 3:53
1/18/17 | 4:15
8/29/17 | 5:31
7/26/17 | 3:39
11/9/16 | 5:08
2/15/17 | 5:19
5/23/17 | 4:56
10/10/16 | 5:46
