publication date: Friday, January 5, 2018 (part of Winter 2018)

category: Inventions

clue: His inventions lit up the 1960s counter-culture, and he did his part by operating a naturist resort.

explanation: Walker invented the lava lamp, which he called the Astro lamp. more…

difficulty: medium

solved by: Russ Wilhelm, LaVonne Lemler, Samir Mehta, Chris Lemler, Matthew Preston, and Erik Bates


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