The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Indoor pollution is 10 times more toxic than outdoor pollution.
62
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Each day, up to 150 species of life become extinct.
-23
Nearly 50% of the world's scientists are assigned to military projects.
71