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http://eschooltoday.com/science/states-and-behaviour-of-matter/what-are-solids.html

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Primary Science Lesson Idea: What is a Solid? | Tigtag

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Why is ketchup so hard to pour? - George Zaidan

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http://www.instructables.com/id/Oobleck/

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https://www.sciencelearn.org.nz/resources/1502-non-newtonian-fluids

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https://www.thoughtco.com/how-oobleck-works-608231

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https://www.scientificamerican.com/article/oobleck-bring-science-home/

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https://www.thoughtco.com/what-is-plasma-608345

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http://easyscienceforkids.com/solids-liquids-and-gases-video-for-kids/

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http://www.chem4kids.com/files/matter_solid.html

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Oobleck and Non-Newtonian Fluids: Crash Course Kids #46.1