physical toys:

Levitating pyrolytic graphite over four neodymium magnets (quadrupole)

Nice beta type Stirling engine running with the heat of your hand

Looks like a normal gyro - but....

it's unstable - precession becomes "stronger"

and at the end it flips. As every cryo it conserves the angular momentum => in the "flipped" position it a the same spin direction as in the first picture :-)



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[ Gebhard Matt ]