Here's Why You Shouldn't Leave a Giant Parabolic Mirror in Your Car on a Sunny Day Gizmodo - July 25, 2018
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======================================= San Francisco School Teacher MELTS The Rear Of His Subaru After Leaving Homemade Solar Oven In The Trunk. Daily Mail - July 25, 2018
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When my son was in HS they had a solar day. I had a Large Fresnel lens in a frame and took it to the school, and set it up with all the other cookers. I was melting pennies making the teacher very nervous! Mikek
Did you try a nickel or a dime?
I'm to frugal for that! No, not that I recall, just Zinc pennies.
Mikek
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