Sex burns about 360 calories per hour.
860
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 elephant brain weighs about 6,000g.
274
You burn 26 calories in a one minute kiss.
605
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
The earth is approx. 6,588,000,000,000,000,000 tons.
175
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