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
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
In zero gravity, a candle's flame is round and blue.
16
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
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
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116