And for lunch: How to build a solar powered heat cannon....

Number 1: Melt your way through just about anything.

May I introduce Grant Thompson, the King of Random? He's about to show us just how much power there is in a sunny day ....



....and (because I can hardly leave it at just that) here's how you build that concrete melting heat ray:



Grant has a whole series of videos, and they're a great example of how much you can do with just a little bit of curiosity and engineering knowledge - I can't recommend them enough!