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Brand new, open box item. The box may have some damage but the item is unaffected. Count down to Christmas with hands-on discovery in the National Geographic Science and Rock Collection Advent Calendar. Behind each of the 24 doors is a new surprise—either an exciting science experiment or a real gemstone specimen to build an impressive rock collection. With engaging activities and authentic geological treasures, this STEM-filled calendar makes every day leading up to the holiday both educational and unforgettable. 24 DAYS OF SCIENCE: Open a new door each day to reveal either a fun experiment or a genuine gemstone specimen. 13 HANDS-ON EXPERIMENTS: Includes exciting activities like revealing secret messages, making a glowing test tube, floating coins, and growing a colorful crystal tree. 11 REAL GEMSTONE SPECIMENS: Features carnelian, chevron amethyst, snowflake obsidian, tiger’s eye, a geode, and more, plus a storage pouch to keep the collection safe. FINAL-DAY DIG ACTIVITY: Unearth a pyrite (fool’s gold) specimen from a mini dig brick for an authentic geologist experience. STEM LEARNING FUN: Encourages curiosity, critical thinking, and a love for science through interactive, educational play.