Campfire Light Show

(YouTube link)

Tim Roman and friends pulled out their Wicked Lasers and pointed them at the campfire, producing an eerie psychedelic portal to another world. They used the Spider 3 Arctic blue laser and the Krypton green laser, which aren't your average laser pointers. I don't know much about lasers, but it seems to me the only safe way to do this is to watch it on video. -via Viral Viral Videos

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Class 4 lasers are getting into the area where even looking at diffuse reflections has a risk of damaging your eye, without the beam itself hitting you. Plus there is always some risk of getting hit by the beam directly if something it is reflecting off of moves, or you reach into the beam forgetting to take off a ring. I don't see any laser goggles here, and while you can frequently get by without them, it is a gamble most of the time. There are plenty of stories of researchers going years with bad goggle habits and then suddenly getting serious eye damage that could have been prevented, some of which are plastered on lab doors and safety cabinets to remind people why they should be wearing their goggles (I made the mistake of letting my wife read one the laser is the second biggest danger to not wearing goggles).
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