The average home creates more pollution than does the average car.
33
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
For every gallon of sea water, you get more than a quarter pound of salt.
45
Pure water (H2O) does not conduct electricity on its own.
46
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
A cubic yard of air weighs about 2 pounds at sea level.
31
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39