The cat brain weighs about 30g.
167
You burn more calories sleeping than you do watching television.
348
By weight, Bone is five times stronger than steel.
417
The earth is approx. 6,588,000,000,000,000,000 tons.
175
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
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5
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