Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Scientists in Germany have developed a candy that doesn't cause cavities.
11
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