· The most heavily traveled segment of the Interstate Highway System is I-405 in Los Angeles, with an average of 390,000 vehicles a day.
· The first Harley-Davidson motorcycle, built in 1903, used a tomato can for a carburetor.
· The sound you hear when you crack your knuckles is actually the sound of nitrogen gas bubbles bursting.
· The world’s first parking meter was installed in Oklahoma City on July 16, 1935.
· Almonds are members of the peach family.
· The U.S. Department of the Treasury first issued paper currency of the United States in 1862 as a result of a shortage of coins and the need to finance the Civil War.
· The ball on top of a flagpole is called a “truck.”
· Wearing a wedding ring on the fourth finger of the left hand dates back to ancient Egypt, where it was believed that the vein of love ran from this finger directly to the heart.