Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Out of all the senses, smell is most closely linked to memory.
146
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
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
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61