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Nicole Grizzle says
I know about uva that can go through glass, but why didn't I get burned before I got on the bus?
It could be many things. The UV index could have been lower during your camping trip, you were in less direct sunlight (maybe you were in the shade?). Sunburn isn't always immediate too. It can take as long as 6 hrs for redness/pain to show.
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Mary Wickison says
The magnifying glass thing works with infrared, not ultraviolet. No it wasn't bad. It was barely a sunburn and it happened a few years ago.