National Geographic Science Kit & Rock Collection Advent Calendar - 24 Days of STEM Experiments for Kids Ages 8-12 YONSEN adding a touch of Scandinavian-inspired

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National Geographic Science Kit & Rock Collection Advent Calendar - 24 Days of STEM Experiments for Kids Ages 8-12 YONSEN adding a touch of Scandinavian-inspired24 DAYS OF SCIENCE Each day of December as Christmas approaches, kids will open an exciting science experiment to conduct from our world class science kits, or a gemstone specimen to add to their collection! CONDUCT 13 FUN EXPERIMENTS We selected 13 incredible experiments from our science kits for this advent calendar. Kids will love hiding revealing a secret message, making a test tube glow, floating coins, growing a colorful crystal tree & much