Did you know...?

Bones are strong and rigid, and built to withstand a lot of force — pound for pound, they are stronger than steel. But, surprisingly, they are not the hardest substance in the body.
That title goes to another part of the skeletal system: tooth enamel. This substance protects the crown of teeth and owes its strength to its high concentration of minerals (calcium salts in particular), according to the National Institutes of Health.