A fifth-grade girl sits in class singing her new favorite song. She and her classmates listen on their iPod headsets, bobbing their heads and moving to the beat.

"States of matter. Aren't they cool?" the kids sing. "States of matter ... ."

No, this isn't the latest hit by Hannah Montana or the Jonas Brothers.

Crystal Chavez, their teacher, is belting out a rock song about solids, liquids and gases.

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