And they realized they could use this lens to focus the power of the sun and burn just about anything...
Before application of concentrated solar power:
(These are lead wheel weights--fingers included for scale.)
This next video shows the melting of the lead shown in the pics above. I would encourage you to watch past the first part--I finally figure out that I need to focus the video while it's shooting. (It gets better, I promise.)
Here is the brick after it's had lead melted on it. The circle in the middle is melted brick, a/k/a glass.
Lead melts at 400-500^C
Aluminum at 660^C
Bricks melt at 1,000^C