In zero gravity, a candle's flame is round and blue.
16
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Iron weighs more after it rusts.
16
Hot water can freeze faster than cold water.
181
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
The bark of an older redwood tree is fireproof.
65