If science textbooks seem too intimidating, get your hands on this project kit from Thames & Kosmos. Along with learning the fascinating process of crystal formation, it will also educate you about the physics of color and light. You can display your grown crystal on your bedside table or window ledge. Details: Requires 2 AAA batteries (included) For ages 8 and up Contents: Die-cut black cardboard Plastic base with lid Transparent plastic cone Color-changing LED Double contact latch Switch with eyelet and contact latch Black wire with eyelet and contact latch Potassium aluminum sulfate powder (50 g) Safety goggles Measuring cup (125 ml) Wooden spatula Wooden stick 2 contact springs 2 black screws 2 silver screws