Iron weighs more after it rusts.
68
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
The force of a suction cup is calculated using F=AP.
15
In the 1950s, the US government placed beer next to an atomic bomb blast to determine if it was still drinkable. The result: in the event of a nuclear war, beer is safe to drink!
16
Nylon is made from coal and petroleum.
42
The average home creates more pollution than does the average car.
33
Sound travels about 4 times faster in water than in air.
408
Nearly 50% of the world's scientists are assigned to military projects.
71