Sound travels about 4 times faster in water than in air.
408
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
The Manchineel Tree is so poisonous, rainwater dripping off it’s leaves will burn your skin.
17
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