4.5 pounds of sunlight strike the Earth each day.
27
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Scientists aren't sure what color dinosaurs were.
312
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
According to studies, men change their minds two to three times more often than women.
72
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Pure water (H2O) does not conduct electricity on its own.
46
Sound at the right vibration can bore holes through a solid object.
134