Add 1 tsp. of liquid food coloring to 1 cup of water. Drizzle the colored water onto the soil surrounding the base of a plant. Wait 24 hours for the water to absorb. Apply another identical dose if the color change was not sufficient.
"Building Bristlebots: Basic Toothbrush Robotics": With a bag of toothbrushes and some basic electronics supplies, you can give a group of kids a fun introductory #robotics experience! Once you have a crew of working bots, get creative building mazes and tracks!