Dozens of centuries-old stone grenades from Ming dynasty discovered at Great Wall of China

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The 400-year-old stone-shelled grenades unearthed near the Badaling Great Wall are similar to these "thunder crash bombs" made from pottery shell, which were found in a Ming dynasty shipwreck. A cache of 400-year-old stone grenades inscribed with orders warning guards to watch out for enemies has been discovered at the Great Wall of China near Beijing. The finding shows the astonishing variety of early gunpowder weapons used during the Ming dynasty, which ruled China from 1368 to 1644, according to Tonio Andrade , a professor of history at Emory University in Atlanta who wasn't involved with the discovery. "I've argued...