Bones

A human bone is 5 times stronger than a piece of steel of the same weight.
So you're made of some very tough stuff.

Fear

Hippopotomonstrosesquippedaliophobia is the fear of long words. Whoever thought of that obiously wasn't thinking right.

Hair

Blondes have more hair on their heads than brunettes.

Prickle

A group of porcupines is called a prickle.

Old Foot

The oldest human footprint found is 350000 years old.