He's got a clock at the exploratorium in San Francisco. https://www.exploratorium.edu/video/tim-hunkins-tinkerers-clock https://www.exploratorium.edu/video/tim

He's got a clock at the exploratorium in San Francisco. https://www.exploratorium.edu/video/tim-hunkins-tinkerers-clock https://www.exploratorium.edu/video/tim-hunkins-tinkerers-cl...