Source: NOVA: "Secrets of Lost Empires II: Medieval Siege" This media asset was adapted from NOVA: "Secrets of Lost Empires II: Medieval Siege" In medieval times, one of the most fearsome weapons was ...
Michael Kanellos is editor at large at CNET News.com, where he covers hardware, research and development, start-ups and the tech industry overseas. You can store energy in chemical batteries.
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