Blue eyes are the most sensitive to light, dark brown the least sensitive.
105
More than 10% of the world's salt is used to de-ice American roads.
54
Pollen never deteriorates. It is one of the few natural substances that lasts indefinitely.
58
Couples' personalities converge over time to make partners more and more similar.
235
If left alone, 70% of birthmarks gradually fade away.
193
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
Only humans shed emotional tears.
331
An underwater forest off the coast of Alabama that is 50,000 years old was uncovered by Hurricane Katrina.
16