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In this electrochemistry activity, young learners and adult helpers create a battery from a potato to run a clock.

Learners mix a solution of luminol with hydrogen peroxide to produce a reaction that gives off blue light.

Visitors mix urea with water in one flask and mix calcium chloride with water in another flask. They observe that the urea flask gets cold and the calcium chloride flask gets hot.

In this physics activity (page 4 of the PDF), learners will--using nothing more than a coat hanger and some string--explore and understand sound energy and how it moves.