Chile peppers are notoriously hot.
Food researchers explain it's the capsaicin in the peppers that makes them hot. Recently, scientists were surprised to discover that capsaicin is also the source of a medical breakthrough, seen here on TV for the first time. Infants are born with a genetically determined number of taste buds. Some have only a few hundred, while others have tens of thousands per square centimeter. The mushroom-shaped structures on the tip of your tongue are called fungiform papillae.