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You can make a movable hole in soap film with a loop of thread. It's surprising when you first see and it's fun to think about why it behave (more)

You can make a movable hole in soap film with a loop of thread. It's surprising when you first see and it's fun to think about why it behaves the way it does. It's also a useful metaphor for cell membranes so I explore that a little bit too.

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Glenn Watson
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