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Technically, oobleck is a non-Newtonian fluid. If that sounds like total gibberish, hang in there for a moment. A non-Newtonian fluid is a fancy name for a substance that isn't a liquid or solid. It takes on properties of both, depending on how much pressure is applied to it. This describes oobleck perfectly: a fun, mysterious substance that sometimes acts like a liquid and others, a solid. Oobleck first gained fame in the 1949 Dr. Seuss book Bartholomew and theOobleck as a mystical substance that comes from the sky. Today, making your own oobleck is incredibly simple to do.

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1. Gather the oobleck ingredients

Making oobleck requires just two ingredients: cornstarch and water. You can also add food coloring if you wish, but it isn't required. Plain white oobleck can be just as fun as colored oobleck! The exact measurements for the cornstarch and water depend on how much oobleck you want to make. The general rule of thumb is two parts cornstarch to one part water, so a good amount to start with is two cups of cornstarch and one cup of water.

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