What Is The Most Common Letter In The English Alphabet?

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Many feet bones don't harden until you're an adult.

Feet are enormously complex parts of the body. Each foot contains 26 bones, as well as 33 joints and 19 muscles, which work together to allow for a huge range of motion and movements.

But many of these bones remain cartilage throughout a person's childhood, slowly ossifying into bone as the years go on.