Some lions mate over 50 times a day.
Diamonds are the hardest known substance.
The largest flying animal was the pterosaur which lived 70 million years ago. This reptile had a wing span of 36-39 feet (11-11.9 meters) and weighed 190-250 pounds (86-113.5 kilograms).
There's enough gold in the Earth's crust to cover the entire land surface knee-deep.
Rats multiply so quickly that in 18 months, two rats could have over 1 million descendents.
Interstellar space is not complete vacuum: there are a few hydrogen atoms per cubic centimeter.
Katmandu is the capital of Nepal.
The giraffe is one of the quietest animals: it has no vocal chords to make any noise.
The acceleration rate of a flea's jump is 20 times that of a space shuttle during launch.
The sun is 330,330 times larger than the earth.