By weight, Bone is five times stronger than steel.
417
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 average person's skin weighs twice as much as their brain.
131
The cat brain weighs about 30g.
167
The 1 yen coin can be used as a weight, because it weighs exactly one gram. Also, it can float on water.
19
A hummingbird weighs less than a penny.
1k
Most elephants weigh less than a blue whale's tongue.
442