Drew on stones, wood, sticks, anything that can create symbols and mark itself different from the other symbols. The earliest European cave paintings date to the Aurignacian, some 32,000 years ago. Its purpose is not exactly known.

Latin alphabets are now the most commonly used characters in the world. It was estimated to have begun adoption in 7 BC going through multiple iterations. Paper was developed a few years later at an estimated 2AD.

ENIAC (for Electronic Numerical Integrator and Computer) was the first true all-purpose electronic computer. Unveiled in 1946 in a blaze of publicity, it was a monstrous 30-ton machine, as big as two semis and filled with enough vacuum tubes (19,000), switches (6,000) and blinking lights to require an army of attendants. Computers and digital sophistication have since dominated the world in all forms (Ipad, tablets, smartphones etc)

1990 - Powerpoint was released to the world and slide-based presentations started to dominate the web. The ease of use of presentation software can save a lot of time for people who otherwise would have used other types of visual aid—hand-drawn or mechanically typeset slides.

"Death by PowerPoint" is a criticism of slide-based presentations referring to a state of boredom and fatigue induced by information overload during presentations such as those created by the Microsoft application PowerPoint.