Fine-grained volcanic ash can be found as an ingredient in some toothpastes.
55
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
Daydreamers are better at solving complex problems.
28
The number of text messages sent and received in a given day is greater than the world's population.
198
The average American uses eight times as much fuel energy as an average person anywhere else in the world.
28
Ice isn't slippery. What makes people and things slip on ice is water. A thin layer of ice melts when pressure is applied to it and it is this wet layer on top of the ice that is slippery.
153
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