Had a mechanical engineer designed the human frame, he would no doubt have built the jaws after the fashion of a nut cracker, with the muscles placed at the ends of the jaw levers, and the teeth ...

Eating vegetables might permanently damage your teeth In tests on real human teeth, scientists discovered that eating vegetables can permanently damage the enamel layer that covers teeth.

A school year’s worth of short, accessible image-driven posts that invite a variety of kinds of writing. 2d ago By The Learning Network ...