"It was crazy. I knew that I wasn't where I supposed to be, and it took me a minute to realize, you know, what was happening."
Matt hasn't broken a single bone. How could that be? Scientists estimate Matt hit the ground traveling at least 30 miles an hour. Yet his bones protected his internal organs from being smashed.
"Lock the door."
"Got it."
Our skeleton is made up of 206 bones, from the largest in our legs and arms to the tiny bones in our toes and fingers. They give us the tough flexible frame that lets us push and pull on our will.
Bone is incredibly strong.
Pound for pound, bone is stronger than concrete. It has a strength-to-weight ratio found in no other natural material on earth.
The secret of bone's strength and lightness lies inside. It is a matrix of hollow cells; its walls are as thin as paper.
Bone gets its rigidity from calcium and phosphorus, materials found in seashells and teeth. But astonishingly, almost half of our bone mass is soft and alive, allowing our bones to bend.
Every seven years, a healthy human body completely replaces every single bone cell. Thisrenewal keeps our bones incredibly strong and uniquely adaptable.
