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
One human hair can support 3 ounces.
191
By weight, Bone is five times stronger than steel.
417
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 adult human brain weighs about 3 pounds (1,300-1,400 g).
99
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