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In this lesson, students explore a discrepent event by designing experiments to test either what makes a "come-back can" return (a can that when you roll away from you, always returns) or UV beads change color. This activity should come either near the beginning or end of a unit on stars and galaxies. This lesson is part of the Cosmic Times teachers guide and is intended to be used in conjunction with the 2006 Cosmic Times Poster.
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