Have you ever thought about what your bones are made of?
We have the dry facts for you:
20% water
25% bone cells and bone cartilage
55% salts (calcium phosphate, calcium carbonate, calcium fluoride, calcium chloride, magnesium phosphate)
These components are what make the bone strong and stable, but at the same time soft and elastic.
This unique combination makes it so resistant.
This is due to the fact that proteins (for elasticity) and calcium salts (for strength) are present in the bone substance.
And because of this, your femur can withstand up to 1500 kilograms without breaking.