Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
The smell of freshly cut grass is actually a plant distress call.
31
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
In zero gravity, a candle's flame is round and blue.
16
A cesium atom in an atomic clock beats over nine billion times a second.
43
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Most liquid laundry detergents are alive with living organisms that help to break down stains!
88
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310