Tony Finch
dot@dotat.at
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https://dotat.at/:/W6HHL.html
2016-05-09T14:59:11Z
Magnets and marbles! A Rube Goldberg machine. (YouTube)
2016‑05‑09
Magnets and marbles! A Rube Goldberg machine. (YouTube)
https://www.youtube.com/watch?v=QQ9gs-5lRKc
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