Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
The bark of an older redwood tree is fireproof.
65
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
The idea of left brain (logical) and right brain (creative) has no basis in neuroscience and is in fact a myth.
16
Most dust particles in your house come from dead skin.
48