Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Out of all the senses, smell is most closely linked to memory.
146
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Sound travels about 4 times faster in water than in air.
408
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Balsa wood is classified as a hard wood!
41
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
According to studies, men change their minds two to three times more often than women.
72