Abstract
The Elementary School Journal Volume 84, Number 4 S1984 by The University of Chicago. All rights reserved. 001 3-5984/84/8404-0004$01.00 Assumptions, even assumptions that seem logical and reasonable, can make it difficult or impossible for people to understand scientific concepts. Everyone makes assumptions about the way the world works, assumptions like "When the sky is cloudy and dark, it will probably rain" or "Bits of wood float in water." People often use those assumptions to explain how things work: "I can see myself in a mirror because light bounces off me to the mirror and off the mirror to my eyes." Such explanations or conceptions are often based on experience and common sense; however, experience and common sense can sometimes
Published Version
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