In zero gravity, a candle's flame is round and blue.
16
Sound travels about 4 times faster in water than in air.
408
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
Nylon is made from coal and petroleum.
42
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65