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POPSForgotten Chinese Seismograph Members of the court thought the device had failed when the alarm sounded one day and they felt nothing. Doubt turned to astonishment a few days later. A messenger arrived from a town 400 miles away to report that it'd been savaged by an earthquake. Chinese writings talked about Chang Heng's seismograph and ones like it until the Mongols overran China. After that, it vanished as though it had never been...And why is such brilliance so badly remembered? It's probably because people like Chang Heng were tied so tightly to their patrons. They didn't belong to the same loose, open communities of freely moving scholars that have diffused knowledge so effectively in the West.
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POPS2300 Year Old Model Airplane Did anyone actually build a large version of this thing? Well, no one could have come this close to the real shape of flight without working on a larger scale. This little wooden model could hardly exist unless someone had worked with large, light models, or even with man-carrying versions. Archaeologists have looked in vain for a prototype. A large model light enough to fly would be too delicate to stand the ravages of 2300 years. The original -- if it ever was -- has long since joined the desert dust. Whatever form this Egyptian airplane might have taken, it has long since returned to the world of dreams and imagination from which it first came.
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