The center of the Earth is located approximately 6.440 kilometers from the surface.
Only 25 cm of water is sufficient to move heavy objects, even cars.
In Africa poachers kill about a hundred elephants every day.
The average mosquito has 47 teeth.
The first city in the World that has reached one million inhabitants was Rome, around 133 BC. London got its one million inhabitants in 1810, and New York in 1875. Today, there are over 300 cities with more than a million inhabitants.
When the Moon is directly above you, your weigh slightly less than usual.
