Avocados are a fruit, not a vegetable. They’re technically considered a single-seeded berry, believe it or not.
Human teeth are the only part of the body which cannot heal themselves. Teeth are coated in enamel which is not a living tissue.
The first airplane flew on December 17, 1903. Wilbur and Orville Wright made four brief flights at Kitty Hawk, North Carolina, with their first powered aircraft, aka the first airplane.