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*From*: John Denker <jsd@av8n.com>*Date*: Fri, 3 Apr 2020 13:25:46 -0700

Here is something students can do at home. It takes only

a few minutes, but changes how you think about the universe.

Consider a situation where rotating something by 720° is

in some sense the same as no rotation at all. You might

think that a 360° rotation would work just as well – but

this is not true!

The experiment can be done using cardboard, string, and

a little bit of tape. A discussion, with a diagram and

some references, can be found here:

https://www.av8n.com/physics/dirac-string-trick.htm

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