This article is from Proof PositiveSign up today and read it first. Outside of science-fiction stories we have yet to encounter time travelers (so much for changing the past). The basis for most ide... This article is from Proof Positive, our friendly math newsletter that's delivered to your inbox every Tuesday afternoon. Sign up today and read it first. We all have some past events that we'd like to undo. These can be minor moments, such as a fail... [6218 chars]
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