The bark of an older redwood tree is fireproof.
65
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Pure water (H2O) does not conduct electricity on its own.
46
One barrel of petroleum holds 42 gallons.
20
Cold water weighs more than hot water.
93
Brass doorknobs automatically disinfect themselves in about 8 hours.
18