Gallery: Tablets and Slates Before the iPad

Contrary to what you may have read in the technical press, the iPad isn't the first tablet to have changed the world. People have wanted to write things down ever since some officious human decided that people would be more likely to obey the written word than the spoken one. Thus, it's really no surprise that the most famous set of tablets were the Ten Commandments, which are the ancient equivalent of today's "Keep Off the Grass" sign.

Source: http://www.wired.com/gadgetlab/2011/03/gallery-ancient-slates/

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