The Astronomist: A Cubic Millimeter of Your Brain:
Well written article, btw !!
I discovered the formula "(N^2 - N) / 2", way back in Seventh grade..only to find it stated as "N(N-1)/2" in some college book years later.
This deflated my ego slightly (as someone else had already discovered it), but then stoked my ego as I realized I could think things through like other smart people.
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