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I'm reluctant to say "gravity defying", but come on, this is cool! You can levitate a viscous liquid just by shaking it! Not only that but a buoyancy effect appears on the other side. I also show Kapitza's pendulum.

Here's the playlist of videos that feature the stroboscopic effect:
https://www.youtube.com/playlist?list=PLcqX4UMXNKEc8KQxfq5hM25ad9IBQ5S4m

Here's the original upside down pendulum video:
https://youtu.be/gnn21smGVrQ

David Acheson's books are here:
http://academic.jesus.ox.ac.uk/dacheson/

The Kapitza pendulum paper is here:
http://butikov.faculty.ifmo.ru/InvPendulumPTSE.pdf

Here's the research that lead to all the nice levitation footage from Benjamin Apffel, Filip Novkoski, Antonin Eddi and Emmanuel Fort:
https://arxiv.org/abs/2003.04777

You can buy my books here:
https://stevemould.com/books

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