This best-selling year STEM Activities Bundle contains 9 months of seasonal challenges for your little engineers, with 3 STEM Activities and 1 Bonus Brainbuilder per month for a total of 36 NGSS Aligned STEM Challenges!*INCLUDES BACK TO SCHOOL, FALL, HALLOWEEN, THANKSGIVING, CHRISTMAS, WINTER, VALENTINE'S DAY, ST.PATRICK'S DAY, EASTER, SPRING, END OF THE YEAR, and SUMMER STEM ACTIVITIES AND CHALLENGES!***SAVE BIG WHEN YOU PURCHASE THIS DISCOUNTED ALL YEAR BUNDLE!******TOP 20 ALL TIME BEST SELL