Unhackable Secret Messages Travel 120 Kilometers!

Scientists just created a super-secure way to send secret messages using tiny particles of light that can't be hacked or spied on. They sent these special quantum keys [special unbreakable codes] through fiber optic cables [thin glass tubes that carry light] for over 120 kilometers without any problems, and kept it running smoothly for six hours straight. This could one day protect everything from bank secrets to top-secret government messages!