3 + 15 =

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“The most spectacular move the top makes is the jump to its stem. Sometimes it does it so so violently that it hops off the surface it’s spinning on. It’s eye-catching, but it’s just a continuation of what was already happening; friction from the spin pushing the center of mass upwards.” (Esther Inglis-Arkell, http://bit.ly/2FIB8Yk)