24 Days of Science - As Christmas approaches, each day in December, kids will unpack our world-class science kits and conduct an exciting science experiment or unwrap a gemstone specimen to add to their collection!Perform 13 Fun Experiments - We've curated 13 exciting experiments from our science kits for this advent calendar. Kids will love hiding and revealing secret messages, making test tubes glow, levitating coins, growing colorful crystal trees, and more!Collect 11 Amazing Specimens - The gemstones for kids in this STEM set include Carnelian, Herringbone Amethyst, Snowflake Obsidian, Geode, Tiger's Eye, and more! The new collection also comes with a storage bag.Dig up a special specimen on the last day - The final piece in this collection is an amazing specimen of Pyrite (Fool's Gold), which kids will dig out from a mini digging brick, just like a real geologist! Award-Winning Products - Winner of the Toy Association's Toy of the Year Award, Blue Marble proudly develops products that foster education, imagination, and creativity, with a U.S.-based support team to ensure a best-in-class experience!