The United States has paved enough roads to circle the Earth over 150 times.
72
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Americans throw out 4.5 pounds of trash a day - twice that of 40 years ago.
76
In the U.S. the typical school year is 180 days long. In China, the typical school year is 251 days.
7