Bound by two

Popular Science - - HEAD TRIP - by Claire Mal­darelli

THE COOL THING ABOUT THIS ENIGMA IS THAT ONLY TWO POS­SI­BLE AN­SWERS can fill each blank: zero and one—and each grid has a sole so­lu­tion. But only two con­sec­u­tive ze­ros or ones can sit next to or below each other, and each row and col­umn must have the same num­ber of ze­ros and ones. No row or col­umn can be the same. Hint: Find pairs (an­swers on page 124).

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