The Kitchen Pantry Scientist, Liz Heineke, shares a simple recipe for making sidewalk chalk. (Make in a disposable container or large plastic bag. Plaster of Paris should not go down the drain!) Mix ...

Check the size of your 1/2-in. plywood backing board. Then, cut the fiberglass window screen to be eight inches larger than it in both directions (so there are four inches of overhang on each side).

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...