Setting the scene…
Interactive story
Gravity's Ingenious Seesaw
A gravity battery that recharges itself by unbalancing a weighing scale up high, and using this to lift a balanced weighing scale down below.
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Previously
…Lena looked from the small sphere in Thorne’s hand to the intricate model on the table. The skepticism hadn't entirely vanished, but it had been joined by a nascent sense of wonder, a grudging respect for the sheer audacity and meticulousness of Thorne’s vision. She knew, with a certainty that chilled her to the bone, that she would have to subject this to the most rigorous scrutiny imaginable. But for the first time, she also felt a stir of something else: the intoxicating possibility that Aris Thorne might just be onto something truly extraordinary. The laws of motion, it seemed, were about to be put to a most intriguing test.