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- Richard Gatling invented a rapid-fire gun to reduce the need for large armies, but it became a weapon of mass killing.
- German rocket enthusiasts dreamed of space travel, but their work led to the V-2 rocket used in warfare.
- Alberto Santos-Dumont hoped the airplane would promote peace, but was horrified by its use in war.
- Alfred Nobel created dynamite for peaceful construction, yet it was used in conflicts and he later sought a weapon so terrible it would end war.
- Mikhail Kalashnikov invented the AK-47 for defense, but was tormented by the deaths it caused.
- Leo Szilárd helped create the atomic bomb, then desperately tried to prevent its use, warning of an arms race, but his warnings were ignored.