* The largest man-made lake in the U.S. is Lake Mead, created by Hoover Dam. *
* The Stegosaurus dinosaur measured up to 30 feet (9.1 meters) long but had a brain the size of a walnut. *
* The human eye blinks an average of 4,200,000 times a year. *
* Human jaw muscles can generate a force of 200 pounds (90.8 kilograms) on the molars. *
* 40 to 50 percent of body heat can be lost through the head (no hat) as a result of its extensive circulatory network. *
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