by George Barany and Friends

This "mid-week level" puzzle was posted on December 18, 2012, the centennial of an important event in the annals of scientific discovery. After completing the puzzle (spoiler), you may want to read more by clicking here (fairly short and absolutely current) or here (rather comprehensive). Update: This puzzle appeared in the April 2014 issue of Natural Selections, as accessed here.

Click here to view or download the puzzle in PDF format; here to download it as a puz file; here to download it as an ipuz file [requires the free Puzzazz app to solve]; here to solve the puzzle interactively (thanks to Jim Horne); here for the solution. Thanks to Victor Barocas, Marcia Brott, Noam Elkies, Ben Geisbauer, Michael Hanko, and Martin Herbach for contributions to the construction and cluing of the puzzle.

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More puzzles here (all), here (science), and here (tributes).

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