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).

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 ...