This Mysterious Material Moves Around on Your Hand

A video on YouTube. In Science & Engineering, a Krater category.

Summary by Krater

The creator tests a Fortune Teller Miracle Fish to see how it moves in the hand, then investigates why it curls up, testing body heat, artificial hand models, and water vapor.

From the video

Answers: How does a fortune teller miracle fish work?

fortune teller miracle fish mechanics
cellulose moisture absorption
why fortune teller fish move

What it concludes

The movement of the fortune teller fish is not caused by the heat of the hand.
The curling motion is caused by the absorption of water vapor from the hand or environment into the cellulose material, causing it to expand unevenly.
Fortune teller fish are made of cellophane, which is regenerated cellulose rather than plastic, and they burn to ash like paper instead of melting.

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