Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Each day, up to 150 species of life become extinct.
-23
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Indoor pollution is 10 times more toxic than outdoor pollution.
62
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6