Pi wasn't invented so much as discovered. Pi is the ratio of a circle's circumference divided by the diameter. One could say that no one invented it, but that it was discovered. The Egyptians and the...
It partly depends on what you mean by "computer", but the earliest claim is that Charles Babbage invented the first programmable computer in 1822. The machine was called a "difference engine" and it...
There were many, many people involved as the technology evolved from an opto-mechanical device to one entirely electronic from the 1870s through the 1920s. In 1925, John Logie Baird made the world's...