Paper!
By Adam Rifkin
Paper, and the pulp papermaking process, was said to be developed in China during the early 2nd century AD by the Han court eunuch Cai Lun, although the earliest archaeological fragments of paper derive from the 2nd century BC in China.
Paper is a perfect product: it's portable, inexpensive, and has infinite resolution.
And don't get me started on post-it notes.
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