☀️ תנור שמש מקופסת פיצה

Can an empty pizza box actually cook food? Yes, really - and it's one of the coolest builds in this week's maker challenge. All you need is a cardboard pizza box, aluminum foil, plastic wrap, black construction paper, a wooden skewer or stick, and some tape or glue. Start by cutting a square flap into the box lid, leaving a couple of centimeters as a border. Cover the inside of that flap completely with foil, shiny side out - this becomes your reflector, bouncing extra sunlight into the box. Next, tape a layer of plastic wrap over the opening you cut, on both the top and bottom of the flap, so it creates a clear, sealed window. Inside the box, line the bottom with black paper. That color choice matters: black absorbs far more sunlight than any other color and heats up much faster. Close the box, then prop the foil-covered flap open at an angle using your stick, so it works like a mirror, aiming sunlight straight through the plastic window. Now take your oven outside on a sunny day and angle it directly at the sun. What happens next is called the greenhouse effect: sunlight passes easily through the plastic wrap, warms up when it hits the black paper, and then gets trapped inside because it can't escape back out through the plastic as easily as it came in. Within about twenty or thirty minutes, the inside temperature can climb by dozens of degrees - easily enough to melt chocolate over a marshmallow, or warm up a slice of pizza.