If you want to reheat some old pizza outdoors, you can turn any pizza box into a makeshift solar oven.

This tip is admittedly a little silly, but it still looks like a ton of fun. The video above will walk you through the entire process, but basically you'll be cutting a transparent window into your box, and reflecting sunlight into it with a flap of aluminum foil. It won't get hot enough to cook raw food, but you could use it to reheat anything that was pre-cooked, or even to melt cheese or marshmallows.

Certainly, there are easier ways to heat up pizza you're at home (I'd recommend a skillet), but I could see this coming in handy at a tailgate, or on your next camping trip.

How to Turn a Pizza Box into a Solar Oven | Howcast via Serious Eats