Pumice is the only rock that floats on water.
14
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
The use of emoticons affects our corresponding brain areas and can actually trigger emotions.
21
Hot water can freeze faster than cold water.
181