When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
In zero gravity, a candle's flame is round and blue.
16
Pure water (H2O) does not conduct electricity on its own.
46
Each day, up to 150 species of life become extinct.
-23
The smell of freshly cut grass is actually a plant distress call.
31
Iron weighs more after it rusts.
16
A ball of glass will bounce higher than a ball made of rubber.
73
Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3