Fine-grained volcanic ash can be found as an ingredient in some toothpastes.
55
Not swinging your arms when you walk increases the effort of walking by 12%, the equivalent of walking 20% faster or carrying a 10 kg backpack.
12
The Pittsburgh Steelers were originally called the Pirates.
50
By peeing in the shower, you can save 1,157 gallons of water a year.
31
There are 2,500,000 rivets in the Eiffel Tower.
98