They also protect the important organs inside you. Your ribs keep your heart ... Most of us have the same kind of body parts in the same places. You have a head and a neck. You have arms, elbows ...

They also protect the important organs inside you. Your ribs keep your heart ... Most of us have the same kind of body parts in the same places. You have a head and a neck. You have arms, elbows ...

Recently, scientists at Stanford University began to wonder why identical lab mice, bred with the same DNA and brought up in ...