Interesting Engineering on MSN2d
US firm’s gamechanger robot spy can track submarines for years without getting caught
California-based defense company Anduril has developed a unique robot that can spy on underwater submarines for years without ...
Century-old LEMON used by German spy to send secret messages from Britain in invisible ink during WW1 goes on display
A 110-year-old lemon used by a German WW1 spy to send secret messages from Britain with invisible ink is going on display in ...