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An hypothesis is an idea, notion, conjecture, assertion or statement about reality. The activity we call science is about putting forward and testing hypotheses. For example, you could test your notion that nickel might be magnetic by putting it near a magnet. If it was clearly attracted, you could suggest that "nickel is magnetic" was not just an hypothesis but a fact. If not, you might test with an even stronger magnet, and so on.

Testable hypotheses, especially those that help to explain why things act the way they do, are important because they prompt activities which can improve scientific knowledge.

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11y ago

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