Pizza Hut turn its pizza box into a solar eclipse viewer

To safely watch the total solar eclipse on August 21. Without damaging your eyes, you"ll need certified eclipse glasses or a pizza box.

In a new video, Pizza Hut demonstrates how to turn an empty pizza box into a viewer. That will let you watch a projection of the eclipse.

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To make it, you will need a cardboard pizza box, foil, scissors, pen, tape and a sheet of white paper. First, detach the two sides of the box from each other.

Next, cut a small hole in the center of the pizza box"s top. At last, Tape a square piece of foil over it, and poke a tiny hole in the foil.

Finally, to watch a projection of the eclipse, stand with the sun behind you, with the tin foil-side of the box about a few inches above the other side of the box. Further, you should see an outline of the moon as it crosses over the sun on the piece of paper.

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The pizza box viewer is essentially a pinhole camera. Harnesses a property of light called diffraction to bend and magnify light. In this case, that"s the sun as it eclipses.

Unlike certified protective glasses that are quickly selling out, a pinhole camera won"t allow you to look directly at the eclipse, but it"s good, last minute-alternative.

However, looking straight into the eclipse without protection can damage your eyes or even blind you. According to NASA, the only time it"s OK to look at a solar eclipse is if you are in the path of totality - a specific area where the moon will completely obstruct the sun - for a minute or two.

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The hack is both an easy way to make an eclipse viewer and a clever strategy by Pizza Hut to sell more pizzas.