re: #297 Decatur Deb
In the 60s the French built a vast parabolic mirror array to focus sunlight across a valley, a mile or two away. The purpose was to generate a couple thousand degrees in a target structure, providing a chemical-free heat for high-temp research. Some where near Grenoble, IIRC. Will check.
That’s what they want you to believe.
What they were really doing was frying critters.