The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
The weight of air in a milk glass is about the same as the weight of one aspirin tablet.
63
When glass breaks, the cracks move at speeds of up to 3,000 miles per hour.
423
If you get water flowing fast enough, it can cut metal.
354
Tae Kwon Do is only around 60 years old.
64
Mentally doing a task makes you better at it. Your mind can barely tell the difference.
18
The face of a penny can hold about thirty drops of water.
85
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