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
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
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
At 15 years old, Jack Andraka invented a method of diagnosing pancreatic cancer, thus helping to save the lives of millions of people around the world. It is 168 times faster, 26,000 times cheaper, 400 times more sensitive, and has a 99% success rate.
15
Out of all the senses, smell is most closely linked to memory.
146
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65