Add Yahoo as a preferred source to see more of our stories on Google. x-ray scans of early human skulls. the teeth are colored red, green, orange, blue, and purple to show the differences among them ...

Oral frailty can shorten your life expectancy, so those dreaded visits, drills and all, really are for your own good.

Breakthroughs, discoveries, and DIY tips sent six days a week. Terms of Service and Privacy Policy. Putting together the puzzle of human evolution sometimes comes ...