One third of the electricity produced on earth is used to power electric light bulbs!
75
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Iron weighs more after it rusts.
16
One barrel of petroleum holds 42 gallons.
20
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
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13