To Make a Proof "Foolproof," You Need to Get Rid of a Lot of Fools
You've got to love an essay that has the following paraphrase of Plato's <I>Meno</I> dialog:
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<I>Socrates</I>: Here is a square with sides of length 2 and area equal to 4. If we double the area, to 8 units, what will the length of a side be?