Portuguese soldiers used black swords in the Age of Discovery in order to not reflect the light and announce their presence on ships, avoiding also its rusting when used near salt water.
Samsung has built a sentry gun which sits in the Demilitarised Zone between North and South Korea, which is hostile to anyone it senses who cannot provide an authorized access code.
A man in Shaanxi, China, recently realized that the long-handled, blunt-ended object he’d been using for 25 years to crack walnuts was actually a live hand grenade.
A Canadian inventor tried to create a “supergun” which could fire satellites into orbit from a 512 foot-long barrel embedded inside a hill. When Western funding failed, he turned to military application of his ideas for Saddam Hussein, but then he was assassinated in Brussels.
The Pentagon has rocket balls a.k.a. kinetic fireball incendiaries made of rubberized rocket fuel; when ignited, they propel themselves randomly at high speed, bouncing off walls, smashing through doors, turning an entire building into an inferno.
During the WW1 Germans protested against the use of shotguns in trenches by the Americans arguing Hague Convention forbid to employ arms that cause unnecessary suffering.
CIA created a gun that could shoot darts that caused heart attack. Upon penetration of skin the dart left just a tiny red dot. The poison itself worked rapidly and denatured quickly afterwards. It was revealed in 1975 in a Congressional testimony.
In Japan, you are equally likely to die from being struck by lightning as you are from being shot by a gun.
“SLAM” was a cancelled nuclear ramjet missile that could carry up to 16 thermonuclear warheads, travel for months nonstop, spew radiation wherever it went, and flew at tree top levels, killing anyone it would fly over. The ramjet was powered by an on-board nuclear reactor instead of rocket fuel which is why it could fly for an outrageously long time at supersonic speeds. Part of the reason why it was cancelled was because there was no way to safely conduct test flights because of the massive radiation it would emit over the flight path.
In Franklin D. Roosevelt’s original plans for the United Nations, the Four Policemen (the US, UK, Soviet Union, and China) were the only nations allowed to possess weapons more powerful than a rifle.