Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Scientists aren't sure what color dinosaurs were.
312
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 Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Brass doorknobs automatically disinfect themselves in about 8 hours.
18