Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Iron weighs more after it rusts.
16
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Hot water can freeze faster than cold water.
181
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Indoor pollution is 10 times more toxic than outdoor pollution.
62