The bark of an older redwood tree is fireproof.
65
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Nearly 50% of the world's scientists are assigned to military projects.
71
Each day, up to 150 species of life become extinct.
-23
Pumice is the only rock that floats on water.
14
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
One 75-watt bulb gives more light than three 25-watt bulbs.
57