A hummingbird weighs less than a penny.
1k
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 cat brain weighs about 30g.
167
Fidgeting can burn about 350 calories a day.
201
By weight, Bone is five times stronger than steel.
417
One human hair can support 3 ounces.
191
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
The earth is approx. 6,588,000,000,000,000,000 tons.
175