11. Air Ships
The history behind balloons, blimps, dirigibles and zeppelins.
12. Airplane/Aviation
Wilbur and Orville Wright invented the manned engined airplane, which they patented as a "flying machine." Learn about other aviation related innovations.
13. Alcoholic Beverages
Evidence of intentionally fermented beverages exist in the form of beer jugs dated as early as the Neolithic period.
14. Alternating Current
Charles Proteus Steinmetz developed theories on alternating current that allowed for the rapid expansion of the electric power industry.
15. Alternative Energy Related
A list of articles related to the invention and the history of alternative, earth-friendly energy sources.
16. Altimeter
An instrument which measures vertical distance with respect to a reference level.
17. Aluminum Foil - Aluminum Manufacturing Process
The first mass-produced and widely used metal foil was made from tin. Tin foil was replaced by aluminum foil in 1910. Charles Martin Hall discovered the electrolytic method of producing aluminum cheaply and brought the metal into wide commercial use.
18. Ambulance
The concept of ambulance service started in Europe with the Knights of St. John.
19. Anemometer
In 1450, Leon Battista Alberti, the Italian artist and architect, invented the first mechanical anemometer. The anemometer is a device that measures wind speed.
20. Answering Machines
The history of answering machines.
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