Tae Kwon Do is only around 60 years old.
64
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
People who laugh more are better able to tolerate pain - both physical and emotional.
36
The symbol on the 'pound' key (#) is called an octothorpe.
82
The roar that we hear when we place a seashell next to our ear is not the ocean, but rather the sound of blood surging through the veins in the ear.
476
When glass breaks, the cracks move faster than 3,000 miles per hour.
47