The Hoover Dam was built to last 2,000 years. The concrete in it will not even be fully cured for another 500 years.The human body contains enough phosphorus to make the heads of 200 matches, enough fat for seven bars of soap, and enough iron to make one nail.
The human body has over 45 miles of nerves.
The human eyes can distinguish about 17,000 different colors.
The Jazz Singer, 1927, was the first movie with audible dialogue.
The largest body of fresh water in the world is Lake Superior.
