Sex burns about 360 calories per hour.
860
Dieters who sleep more take off more fat that those who sleep less.
159
One human hair can support 3 ounces.
191
A hummingbird weighs less than a penny.
1k
The elephant brain weighs about 6,000g.
274
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