Sound travels about 4 times faster in water than in air.
408
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Pure water (H2O) does not conduct electricity on its own.
46
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
Billions of neutrinos pass unnoticed through your body every second.
6
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
One ragweed plant can release as many as one billion grains of pollen!
51