Inventionandtech

ON SEPTEMBER 20, 1956, MORE THAN A YEAR before the Soviet Union launched the world's first satellite, a four-stage Jupiter-C rocket stood on a launch pad at Cape Canaveral. It had three stages-sections that fire in turn and then are jettisoned. The rocket

BEFORE DEPARTING ON HIS DOOMED MISSION ON FEB ruary 17, 1864, Lt. George Dixon slipped a $20 gold piece into his pocket. The young Confederate's sweetheart had given him the coin for good luck, and so far it had worked better than she could have dreamed.

Siegfried Marcus Car

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Understanding the response of granular matter to intrusion of solid objects is key to modelling many aspects of behaviour of granular matter, including plastic flow. Here we report a general model for such a quasistatic process. Using a range of experimen

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