The Fortune Fish is a very thin piece of red cellophane in the shape of a fish, 8. When placed in the palm of your hand, the cellophane fish twists and curls. It moves differently for different people. In some instances, it may rock slightly; in other cases it curls up completely. The key is, however, that the plastic grabs water molecules only on the side in direct contact with skin.
The person operating the fortune teller manipulates the device based on the choices made by the player, and finally one of the hidden messages is revealed. These messages may purport to answer questions hence the name or they may be activities that the player must perform. Use a paintbrush to coat a piece of glass or metal like a cookie sheet with the liquefied gel.
The Fortune Teller Fish is made of the same chemical used in disposable diapers: sodium polyacrylate. This special salt will grab onto any water molecules that it touches, changing the shape of the molecule. If you submerge the fish in water, it won't be able to bend when you place it on your hand. The viscose solution is then extruded through a slit into a bath of dilute sulfuric acid and sodium sulfate to reconvert the viscose into cellulose.
The plastic curls because the dry side pulls the expanding moist side around it. The curling movements come from the orientation of the polymer strands in the plastic. This is called the grain of the polymer. The Fortune Teller Fish is made of the same chemical used in disposable diapers : sodium polyacrylate. This special salt will grab onto any water molecules that it touches, changing the shape of the molecule. As the molecules change shape, so does the shape of the fish.
If you submerge the fish in water, it won't be able to bend when you place it on your hand. If you let the fortune teller fish dry out, it will be good as new. Steve Spangler Science describes the process in a bit more detail:.
As a result, the moist side expands, but the dry side remains unchanged. Science teachers commonly hand out these fish to students and ask them to explain how they work. Students can propose a hypothesis to describe how the fortune-telling fish works and then design an experiment to test the hypothesis.
Usually, students think the fish may move in response to body heat or electricity or by absorbing chemicals from the skin such as salt, oil, or water. Spangler says you can extend the science lesson by having students place the fish on different parts of their bodies, such as the forehead, hands, arms, and even feet, to see if the sweat glands in those areas produce different results.
Students can even test other, nonhuman objects to see if the fish reacts—and predicts the moods and emotions of a desk, countertop or even a pencil sharpener.
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