Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
A cubic yard of air weighs about 2 pounds at sea level.
31
Diamonds can be shattered with a hammer.
-104
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
No matter how cold it gets, gasoline will not freeze.
107
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75