this post was submitted on 13 Jul 2024
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HistoryPorn
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Relive the Past in Jaw-Dropping Detail!
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Never heard of lighting a fire with a magnifying glass?
You get sunburns from UV light, not heat alone
https://www.sciencefocus.com/science/can-i-get-sunburnt-through-glass
Article states, accurately; "you can still get burned with long enough exposure".