One 75-watt bulb gives more light than three 25-watt bulbs.
57
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
Cold water weighs more than hot water.
93
One ragweed plant can release as many as one billion grains of pollen!
51
Pure water (H2O) does not conduct electricity on its own.
46