One barrel of petroleum holds 42 gallons.
20
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Research indicates that plants grow healthier when they are stroked.
173
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
The smell of freshly cut grass is actually a plant distress call.
31
A ball of glass will bounce higher than a ball made of rubber.
73
The bark of an older redwood tree is fireproof.
65
A cubic yard of air weighs about 2 pounds at sea level.
31