The average mosquito has 47 teeth.
Our kidneys have many tubes; if we would merge them, they would form a long thin tube 65 kilometers long.
Oysters can change their sex from male to female. They can do this countless times.
When a man blows his nose, the air speed that comes out under pressure reaches 160 km per hour.
The tallest waterfall on Earth is Angel Falls in Venezuela. There the river Kerep falls from the height of 979 meters.
Every year swallows fly 38.000 kilometers from the northern to the southern hemisphere and back.
