[math-fun] was: 3D printers & musical instruments; now is: formerly 3D printers & musical instruments
26 Jul
2018
26 Jul
'18
12:11 a.m.
----- Airplanes don't have feathers. ----- It's interesting that, mathematically, this is just the dual of ----- Down pillows don't fly. ----- —Dan
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Dan Asimov