Discover more about how changes in matter affect the physical features and atmospheres of Earth and other planets.

		Sharks and Rays: Myth and Reality Article for grades 6 through 12 Is it true that sharks must swim constantly or they will die? Do all rays have poisonous stingers? Can sharks detect a single drop of blood in the ocean? Learn to separate myth from reality.
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Discover more about how forces and motion shape the universe.

		What's the Big Idea? Astronomy Article for grades 3 through 8 Huge distances, gigantic sizes, and long periods of time—astronomy is a BIG subject. We've brought learning about it down to size with this look at the big ideas you need to know.
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Discover what we can learn about our universe by studying light.

		What's the Big Idea? Astronomy Article for grades 3 through 8 Huge distances, gigantic sizes, and long periods of time—astronomy is a BIG subject. We've brought learning about it down to size with this look at the big ideas you need to know.
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