Take one raw egg. With a needle drill a hole in the top of the egg, gently breaking away about 1/2 sq. cm of shell (Illust. C, No. 1). Insert the needle and stir up the yolk and white. Poke another hole in the same end of the egg, about 3 cm from the first hole (Illust. C). Blow through the second hole so that the yolk and white come out the first hole (Illust. D). Have an omelette! Make up a mixture of 50% black, red, yellow, blue or fluorescent green oil-based paint and 50% thinner (eg. turps, petrol, kerosene). Alternatively, make up a solution of colour-fast dye, mixing it with a thickener such as cornflour over heat until you get a gravy-type consistency. Pour this mixture into a~thin-nozzled, screw-top bottle. Seal the second hole of the egg with a pasty mixture of flour and water or candle wax (Illust. E). Pour in the paint/ dye solution through the first hole (Illust. F) and seal it also. You now have a perfect-sized, semi-biodegradable missile. We’ve found these little beauties very effective.