| The parachute was invented by Leonardo da Vinci. |
| The common mousetrap was invented by the same guy who invented the machine gun—Hiram Maxim. |
| Police dogs were first used in 1816 in Scotland. |
| Alexander Graham Bell applied for his patent on the telephone, an "improvement in telegraphy," on Valentine's Day, 1876. |
| The first ever self-adhesive stamps were issued by Sierra Leone in February 1964. |
| The value of "Pi" was first calculated by the Indian Mathematician, Budhayana. |
| Roulette was invented by French mathematician Blaise Pascal. The popular game of chance was a byproduct of his experiments with perpetual motion. |
| The shoestring was invented in England in 1790. Prior to this time, all shoes were fastened with buckles. |
| The Stethoscope was invented by Dr. Rene Laennec in 1816, because he was too embarrassed to listen to a young pretty woman's heart. |
| Leonardo De Vinci invented the scissors. |