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War has been a fact of life ever since the dawn of civilization. But while armies once charged into battle with little more than wooden clubs or stone axes, centuries of innovation have led to a wide range of powerful and efficient weaponry. Trace the history of weapons and other military technology, and learn what today's top engineers and scientists are working on and how these new weapons could change the way wars are fought. Calling all Innovators Today's most exciting and forward-thinking industries are based around science, technology, engineering, and math. The Calling All Innovators series highlights the careers that are changing the world today. Interviews, diagrams, and timelines explore the past, present, and future of these remarkable professions.