When glass breaks, the cracks move faster than 3,000 miles per hour.
47
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
In a year approximately 900 million trees are cut down to make the raw materials needed for American pulp mills and paper.
-16
Less than 3% of the water produced at a large municipal water treatment plant is used for drinking purposes!
24
All the gold ever mined could be molded into a cube 60 feet high and 60 feet wide.
38
Harvard earns enough money from interest on its endowment that it could offer free tuition to every student and still profit.
13