Most dust particles in a US house are made from dead skin. See more

Your system of blood vessels is over 60,000 miles long. That's long enough to go around the world more than twice! See more

The heart beats about 100,000 times each day. See more

Blood is about 78 percent water. See more

Those stars and colours you see when you rub your eyes are called phosphenes. See more

The thumbnail grows the slowest; the middle nail grows the fastest. See more

Sex is biochemically no different from eating large quantities of chocolate. See more

All Humans Are 99.9% Genetically Identical and 98.4% of human genes are the same as the genes of a chimpanzee. See more

The Netherlands has built 800 miles of massive dikes and sea walls to hold back the sea. See more