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
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
More than 10% of the world's salt is used to de-ice American roads.
54
The yin-yang pattern's earliest use is in Rome - not China!
125
The strangers in your dreams are actually people that you've seen in real life.
50
The sound you hear when you crack your knuckles is actually the sound of nitrogen gas bubbles bursting.
244
You burn more calories sleeping than you do watching television.
348
Tsunamis ( tidal waves ) travel as fast as jet planes.
97