Here's another interesting fact: giraffes only need 5 to 30 minutes of sleep in a 24-hour period! They often achieve that in quick naps that may last only a minute or two at a time.
Taste buds have helped us evolve as humans. In the beginning, the sense of taste helped us test the foods we ate: bitter and sour tastes might indicate poisonous plants or rotting foods. The back of our tongue is sensitive to bitter tastes so we can spit out poisonous or spoiled foods before we swallow them. Sweet and salty tastes let us know foods were rich in nutrients.