When Did We Start Using the + and - Signs?

Though most people in this world never want to think about math after high school, let's talk about its symbols. Where and when did the symbols for addition and subtraction get invented? We don't even question them when we see them now. But what the heck did people use before that? More »

Source: http://feeds.gawker.com/~r/gizmodo/full/~3/XzFg9Zf2p9U/when-did-we-start-using-the-%252B-and-+-signs

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