One barrel of petroleum holds 42 gallons.
20
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Scientists in Germany have developed a candy that doesn't cause cavities.
11
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
Scientists are now able to grow 'beating' heart tissue in a lab!
162