Ever get, disappointed when you find out something is just a camera trick and not some really clever new tech?,(reply>), @John Anthony Kazos Jr. I wonder how many clicks "using camera shutter speed to make it seem like the laser has stopped" would have got him on the video...,(reply>), ever get, a stroke from a random unnecessary comma? Seriously though it broke my brain for a second,(reply>), Yes, but not with this one. Still didn't like the video due to the clickbait, though.,(reply>), It is still a really clever making use of existing tech.,(reply>), @Tristan Ritland That's due to the fact that light scatters off the molecules that make-up different materials. The photons themselves do not slow down. But their passage through a medium involves absorption by electrons and re-emission.