One barrel of petroleum holds 42 gallons.
20
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
A cubic yard of air weighs about 2 pounds at sea level.
31
The smell of freshly cut grass is actually a plant distress call.
31
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Sound travels about 4 times faster in water than in air.
408
Research indicates that plants grow healthier when they are stroked.
173
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