The Most Impactful Inventions of the Last 300 Years
Here are the most popular inventions of the 18th, 19th and 20th centuries, from the cotton gin to the camera.
The telephone is an instrument that converts voice and sound signals into electrical impulses for transmission by wire to a different location, where another telephone receives the electrical impulses and turns them back into recognizable sounds. In 1875, Alexander Graham Bell built the first telephone to electrically transmit the human voice.
The History of Computers
There are many major milestones in the history of computers, starting with 1936 when Konrad Zuse built the first freely programmable computer.