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 bark of an older redwood tree is fireproof.
65
A cubic yard of air weighs about 2 pounds at sea level.
31
One cubic foot of gold weighs more than 1,200 pounds!
78
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
Nylon is made from coal and petroleum.
42