These innovations all surprisingly originated in World War I. 

Modern-day drones may look very different, but they originate as pilot-less planes used to drop aerial torpedoes.

Sanitary towels, meanwhile, played a vital role as an absorbent battlefield dressing.

Air traffic control too comes from the First World War, where air-to-ground communication was critical for coordinating aircraft and keeping the skies safe.

Sonar and hydrophones, now used to navigate and monitor the oceans, were first used to find icebergs and submarines. 

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