One third of the electricity produced on earth is used to power electric light bulbs!
75
A ball of glass will bounce higher than a ball made of rubber.
73
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Iron weighs more after it rusts.
68
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65