The 1 yen coin can be used as a weight, because it weighs exactly one gram. Also, it can float on water.
19
The cat brain weighs about 30g.
167
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 earth is approx. 6,588,000,000,000,000,000 tons.
175
Sex burns about 360 calories per hour.
860
A hummingbird weighs less than a penny.
1k
Most elephants weigh less than a blue whale's tongue.
442
Dieters who sleep more take off more fat that those who sleep less.
159