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 average home creates more pollution than does the average car.
33
Balsa wood is classified as a hard wood!
41
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
A cubic yard of air weighs about 2 pounds at sea level.
31
One barrel of petroleum holds 42 gallons.
20