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Meet the American who invented the shopping cart, Sylvan Goldman, Oklahoma supermarket mogul

One of the world’s greatest conveniences was conceived amid its greatest hardships. Sylvan Goldman, son of immigrant pioneers, invented the shopping cart. His brilliantly simple idea was born in Oklahoma during global economic calamity and as the Great Plains were recovering from ecological disaster. “The simplest inventions are always the most fascinating,” Larry O’Dell, the...

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Meet the American who launched modern submarines, John Philip Holland, 'brilliant' self-taught engineer

John Philip Holland’s brilliance transcended time, distance — and depth. Widely proclaimed “the father of the modern submarine,” Holland was born in Ireland and moved to the United States as a young man with the audacious idea of building a “submergible torpedo boat” that could fight silently beneath the waves. He succeeded in remaking maritime...