The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
Your brain is 80% water.
525
Pure water (H2O) does not conduct electricity on its own.
46
A cubic yard of air weighs about 2 pounds at sea level.
31
Sound travels about 4 times faster in water than in air.
408
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116