One 75-watt bulb gives more light than three 25-watt bulbs.
57
Each day, up to 150 species of life become extinct.
-23
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Nylon is made from coal and petroleum.
42
Iron weighs more after it rusts.
16
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
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