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
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Most dust particles in your house are made from dead skin!
67
Most dust particles in your house come from dead skin.
48
The average home creates more pollution than does the average car.
33
Your brain is 80% water.
525
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61