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The puzzle: what is the nature of the dark energy that fills the universe?

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Guidelines for Energy Knowledge The National Science Education Standards - Section 5 (do an "edit" and "find" on "energy" in Section 5 - Assessment in Science Education) explains how to see "energy" as a cross-cutting, unifying concept in science.

What everyone should know about energy depends on their age and current level of knowledge. We have brainstormed on this and created "mindmaps" for: pre-readers, primary students, elementary students, middle school students, high school students, and one for those who want to know all aspects of this unifying concept called energy. Date last updated: August 10, 2005