The light from your computer screen streams at you at almost 186,000 miles a second. See more

It takes about 20 seconds for a red blood cell to circle the whole body. See more

The human heart creates enough pressure when it pumps, to squirt out blood 30 feet high. See more

Most marine fish can survive in a tank filled with human blood. See more

A day on the planet Mercury is twice as long as its year. See more