Iron weighs more after it rusts.
16
Sound travels about 4 times faster in water than in air.
408
One barrel of petroleum holds 42 gallons.
20
The force of a suction cup is calculated using F=AP.
15
The storage capacity of human brain exceeds 4 Terrabytes.
140
The average home creates more pollution than does the average car.
33
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Pumice is the only rock that floats on water.
14