The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Sound travels fifteen times faster through steel than through air.
134
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Iron weighs more after it rusts.
68
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Nearly 50% of the world's scientists are assigned to military projects.
71
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