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
Contrary to popular belief, hair does not grow back darker and thicker after it has been shaved.
71
The weight of air in a milk glass is about the same as the weight of one aspirin tablet.
63
The average American uses eight times as much fuel energy as an average person anywhere else in the world.
28
Passengers on the Beijing subway can pay with plastic bottles.
29
Mentally doing a task makes you better at it. Your mind can barely tell the difference.
18
When withdrawing money from an ATM, the 'whirring' sound before your money pops out is actually a recording. The actual mechanism is so far back that you can't hear it.
282