July 31, 1971 - Men rode in a vehicle on the moon for the first time in a lunar rover vehicle (LRV).

July 31, 1498 - Christopher Columbus, on his third voyage to the Western Hemisphere, arrived at the island of Trinidad.

July 30, 1965 - U.S. President Johnson signed into law the Medicare bill. It went into effect the following year.

July 29, 1957 - The International Atomic Energy Agency was established.

July 28, 1939 - Judy Garland recorded "Over the Rainbow."

July 27, 1940 - Bugs Bunny made his official debut in the Warner Bros. animated cartoon "A Wild Hare."

July 26, 1775 - A postal system was established by the 2nd Continental Congress of the United States. The first Postmaster General was Ben Franklin.

July 24, 1969 - The Apollo 11 astronauts splashed down safely in the Pacific Ocean.

July 23, 1904 - The ice cream cone was invented by Charles E. Menches during the Louisiana Purchase Exposition in St. Louis, MO.

July 23, 1827 - The first swimming school in the U.S. opened in Boston, MA.

July 22, 1926 - Babe Ruth caught a baseball at Mitchell Field in New York. The ball had been dropped from an airplane flying at 250 feet.

July 21, 1930 - The Veterans’ Administration of the United States was established.

July 20, 1969 - Apollo 11 astronauts Neil Armstrong and Edwin E. Aldrin, Jr. became the first men to walk on the moon.

July 19, 1799 - The Rosetta Stone, a tablet with hieroglyphic translations into Greek, was found in Egypt.

July 18, 1936 - The first Oscar Meyer Wienermobile rolled out of General Body Company’s factory in Chicago, IL.

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July 17, 1867 - Harvard School of Dental Medicine was established in Boston, MA. It was the first dental school in the U.S.

July 16, 1945 - The United States detonated the first atomic bomb in a test at Alamogordo, NM.

July 15, 1916 - The Boeing Co., originally known as Pacific Aero Products, was founded in Seattle by William Boeing.

July 14, 1968 - Hank Aaron, while with the Atlanta Braves, hit his 500th career home run.

July 14, 1868 - Alvin J. Fellows patented the tape measure.

July 13, 1832 - Henry Schoolcraft discovered the source of the Mississippi River in Minnesota.

July 12, 1933 - A minimum wage of 40 cents an hour was established in the U.S.

July 11, 1798 - The U.S. Marine Corps was formally re-established by "An Act for Establishing a Marine Corps" passed by the U.S. Congress.

July 11, 1985 - Nolan Ryan of the Houston Astros became the first major league pitcher to earn 4,000 strikeouts in a career.

July 10, 1985 - Coca-Cola resumed selling the old formula of Coke, now renamed "Coca-Cola Classic."

July 9, 1776 - The American Declaration of Independence was read aloud to Gen. George Washington's troops in New York.

July 8, 1889 - The Wall Street Journal was first published.

July 8, 1865 - C.E. Barnes patented the machine gun.

July 7, 1920 - A device known as the radio compass was used for the first time on a U.S. Navy airplane near Norfolk, VA.

July 6, 1933 - The first All-Star baseball game was held in Chicago. The American League beat the National League 4-2.

July 5, 1946 - The bikini bathing suit, created by Louis Reard, made its debut during a fashion show at the Molitor Pool in Paris.

July 4, 1776 - The amended Declaration of Independence was approved and signed by John Hancock, the President of the Continental Congress.

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July 3, 1775 - U.S. Gen. George Washington took command of the Continental Army at Cambridge, MA.

July 2, 1937 - American aviation pioneer Amelia Earhart disappeared in the Central Pacific during an attempt to fly around the world at the equator.

July 1, 1943 - The U.S. Government began automatically withholding federal income tax from paychecks.

July 1, 1847 - The U.S. Post Office issued its first adhesive stamps.