Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Pumice is the only rock that floats on water.
14
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
A ball of glass will bounce higher than a ball made of rubber.
73
Iron weighs more after it rusts.
68
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79