Envelopes were first used in 1839.
Telescopes were invented in 1590.
Iron horseshoes were made in 481.
A barrel of flour weighs 196 pounds.
A hand (horse measure) is four inches.
A rifle ball moves 1,000 miles per hour.
First steamer crossed the Atlantic, 1819.
Assassination of Lincoln, April 14, 1865.
German empire re-established, Jan. 18, 1871.
Storm clouds move thirty-six miles an hour.