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Magic school bus flexes its muscles/ Joanna Cole and Bruce Degen. - [S.l.]: Scholastic, 1995. - 30 min. 30 min.

Because he'd rather be playing ball, Ralphie wants to build a robot to do his chores. As he and his classmates struggle to make the robot, they discover the importance of knowing how joints and muscles work together.


Muscles.

612

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