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Rube Goldberg contraptions: Do try this at home!

Rube Goldberg contraptions: Do try this at home!

This year the annual Rube Goldberg Machine Contest offered families under coronavirus lockdown a way to make good use of their time, by building contraptions that are utterly useless, except to accomplish mundane tasks in the time-honored fashion of the legendary cartoonist. Correspondent Mo Rocca witnesses some of the craziest devices.