Sex burns about 360 calories per hour.
860
The 1 yen coin can be used as a weight, because it weighs exactly one gram. Also, it can float on water.
19
The earth is approx. 6,588,000,000,000,000,000 tons.
175
The cat brain weighs about 30g.
167
Most elephants weigh less than a blue whale's tongue.
442
The Main Library at Indiana University sinks over an inch every year because when it was built, engineers failed to take into account the weight of all the books that would occupy the building.
240
The elephant brain weighs about 6,000g.
274
By weight, Bone is five times stronger than steel.
417