Ghost gun printing is surging, but AI screening and microscopic toolmarks are helping slow untraceable firearm production.

Coffee break Like these emoji riddles, logic puzzles will test your smarts and keep you guessing. Emoji riddle: Yucky ...

For a while missiles looked like potential prey. They have thin skins and are packed with fuel and explosives. Merely damaging the shell of a supersonic missile can create drag, causing it to tumble ...