The life span of a taste bud is ten days. A pregnant goldfish is called a twit. It's impossible to sneeze with your eyes open. One year on Mars is equivalent to 2 years on Earth. The housefly hums in the middle octave, key of F. Tigers have striped skin, not just striped fur.
Hummingbirds are the only animals able to fly backwards.
Oak trees do not have acorns until they are fifty years old or older. If you stretch a standard Slinky out flat it measures 87 feet long. Ninety-eight per cent of the weight of water is made up of oxygen. No matter its size or thickness, no piece of paper can be folded in half more than 7 times. There is enough fuel in a full tank of a jumbo jet to drive an average car around the world four times.