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"A comic book put out by the canadian government in the 1970s (maybe 1974). It features a boy and a girl who find a strange glowing stone (possibly called Oro) that gives them super powers. They use the power of the stone to perform various environmental good things (like insulating a house). The comic book is about energy and energy conservation. Near the end of the book, the boy and girl travel to the future to see what a world without energy looks like. When they return to their own time, they discover that the glowing stone has run out of energy - it being finite too."