US

Why humans can’t regrow teeth

In 2017, Americans spent $124 billion on dental visits. An estimated 90% of adults in the US have fillings. Here's why we can't regrow our teeth.
Why humans can’t regrow teeth
News

Why we eat oysters alive

Raw oysters are still alive - or freshly killed - when you eat them. Many think keeping them alive longer makes them safer to eat, but that's not the full story.
Why we eat oysters alive
News

Why shark scales are so cool

A shark's skin is made up of thousands of armor-like scales, known as denticles. Now, humans are copying that pattern to fight the spread of bacteria.
Why shark scales are so cool
Next Page »