Mexico City sinks about 10 inches a year. See more

Men can read smaller print than women; women can hear better. See more

It took approximately 2.5 million blocks to build the Pyramid of Giza, which is one of the Great Pyramids. See more

The average person falls asleep in seven minutes. See more

If you yelled for 8 years, 7 months and 6 days, you would have produced enough sound energy to heat one cup of coffee. See more

In 10 minutes, a hurricane releases more energy than all of the world's nuclear weapons combined. See more

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

There are more bacteria in your mouth than the human population of the U.S.A. and Canada combined. See more

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

Blood is about 78 percent water. See more

The 'save' icon on Microsoft Word shows a floppy disk, with the shutter on backwards. See more

A typical bed usually houses over 6 billion dust mites. 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

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

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

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