March 17 is St. Patrick’s Day, the day that people wear green, dye their hair green, and squirt food coloring in the toilet to make the water green. People also make green bagels, green beer for the grownups, and so on. You can make your milk green for your cereal in the morning, and green icing for sweets – just take white icing and mix in some food coloring. Remember, food coloring has superpowers: you need only 2-3 drops to tint a whole big bowl of frosting!