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Twenty-one proto-tanks and tank concepts that never made it to battle
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Does Da Vinci’s 500 Year-Old Power Hammer Actually Work?
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Medieval transport - the beginners' guide
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Antikythera Fragment #11 World’s First Precision Lathe - Constructing The Antikythera Mechanism
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Gearless Magnet Bike
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The importance of river crossings in the olden days
8:40