When you stack L-shapes together

You get a square! More exciting mathematical thoughts in the latest edition of Steven Strogatz NY Times column.

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I find myself scrubbing (my own person, that is, please read on) vigorously without being aware only to realize later that I am listening to a fast-paced music while bathing. Most of you would have experienced the connection between music and pace of physical action.
Steven Strogatz is beginning a column in NY Times aimed at you and me. Not to be missed.
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It's been a hotly debated scientific question for decades: was Joe DiMaggio's 56-game hitting streak a genuine statistical outlier, or is it an expected statistical aberration, given the long history of major league baseball?