Shark-Toothed Power Saw Reveals Most Durable Chompers

In an experiment fit for a horror movie, researchers glued shark teeth to a power saw and ran them through hunks of raw salmon — all in the name of learning how these ferocious predators attack and devour their prey, a new study reports. Though unconventional, the "toothy" saw did the trick, and helped the scientists examine the cutting abilities of differently shaped shark teeth. The sharp teeth of tiger, sandbar and silky sharks dulled quickly, whereas the less sharp teeth of the bluntno