One 75-watt bulb gives more light than three 25-watt bulbs.
57
A ball of glass will bounce higher than a ball made of rubber.
73
Most dust particles in your house come from dead skin.
48
Iron weighs more after it rusts.
16
Galalith is a type of plastic that can be made from milk. It is odourless, insoluble in water, biodegradable, anti-allergenic, antistatic, and virtually non-flammable.
1
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Brass doorknobs automatically disinfect themselves in about 8 hours.
18