Add Yahoo as a preferred source to see more of our stories on Google. Houston Museum of Natural Science's Herzstein Foucault Pendulum has stopped after decades, and museum visitors are wondering why.

HOUSTON — The Houston Museum of Natural Science is most assuredly a gem, but it's far from hidden. Instead, we're talking about a feature hidden in plain sight: Foucault's Pendulum. Dropped right in ...

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In this week's episode, Rick explained the basic concept of a pendulum, describing it as "a weight on the end of a string or a chain.