Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
A ball of glass will bounce higher than a ball made of rubber.
73
The average temperature at 40,000 feet above sea level is -60 F.
56
A cubic yard of air weighs about 2 pounds at sea level.
31
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
One third of the electricity produced on earth is used to power electric light bulbs!
75
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6