If your leg bones were made of metal—even the finest space-age alloys— ordinary walking would eventually cause them to fatigue and break. Why doesn’t this happen with bones?
Highest Rated Videos
5,357 views
5,926 views
1,007 views
4,582 views
4,774 views
495,931 views
9,106 views
11,852 views
6,267 views
19,825 viewsRelated Videos
181 views
393 views
1,089 views
Thanks! Share it with your friends!
Tweet
Share
Pin It
LinkedIn
Google+
Reddit
Tumblr