Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The left ear is more responsive to words of love and emotion whispered into it than the right.
40
In zero gravity, a candle's flame is round and blue.
16
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
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75