Rat teeth score 5.5 on Mohr's scale of hardness -- which is harder than steel! Exterminators now add glass to concrete when they patch holes to discourage rats from chewing through - the glass ...

Open wide. A Facebook post has achieved viral status after including photos of a fish that appears to have rows of human-like teeth. According to the Charlotte Observer, the 9-pound sheepshead was … ...

A Facebook post has achieved viral status after including photos of a fish that appears to have rows of human-like teeth. According to the Charlotte Observer, the 9-pound sheepshead was caught off ...

The razor-sharp teeth belonged to conodonts, jawless vertebrates that evolved some 500 million years ago in the Precambrian eon and went extinct during the Triassic period, around 200 million ...

Robert Schofield, a physicist at the University of Oregon in Eugene, and colleagues used a special microscope to examine the sharp “teeth” that line the jaws of leaf-cutting ants called Atta ...