Fine-grained volcanic ash can be found as an ingredient in some toothpastes.
55
Harvard earns enough money from interest on its endowment that it could offer free tuition to every student and still profit.
13
A million dollars weighs about a metric ton. Hence the expression "a ton of money."
66
Women blink nearly twice as much as men.
152
Couples' personalities converge over time to make partners more and more similar.
235
If the human eye was a digital camera, it would have 576 megapixels.
25
There are 293 ways to make change for a dollar.
148
It takes 492 seconds for sunlight to reach the Earth!
44