Image 9 Einstein in 1947Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist best kno… Moozonian · en.wikipedia.org Visit Source
Image 21Johannes Gutenberg's printing press was voted the most important invention of the second millennium. (from Inven… Moozonian · en.wikipedia.org Visit Source
Image 19The wheel, invented sometime before the 4th millennium BC, is one of the most ubiquitous and important technolog… Moozonian · en.wikipedia.org Visit Source
