Each of the basic tastes, she explained, is perceived by taste buds in a unique region on the tongue: sweet at the tip, salty and sour at the sides, bitter at the back. She gave the girls Q-tips ...

Now, let's really get in there. Check out all those bumps. Most people think those are our taste buds, but they're actually the papillae, which help grip your food. In the tips of those papillae ...

The tongue is covered in lots of little bumps. On the walls and grooves of these bumps are thousands of tiny taste buds, too small for the human eye to see. The buds sense the taste of everything ...