{"product_id":"diy-crossbow-ballista-kit","title":"Ballista Kit","description":"\u003cdiv style=\"text-align:left; margin-bottom:8px;\"\u003e\n  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0780\/0425\/7079\/files\/Best_In_STEM_Seal_1.jpg?v=1779466414\" alt=\"Best in STEM Award - STEM.org\" width=\"150\"\u003e\n  \u003cp style=\"margin:4px 0 20px 0; font-weight:bold; letter-spacing:1px; text-transform:uppercase;\"\u003e🏆 2025 Best in STEM — STEM.org\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eBuild your own ballista inspired by the ancient Greek and Roman siege weapon — re-imagined with the hand-held mechanics of a crossbow. Our award winning design is easy to assemble and incredibly satisfying to use, this kit lets you explore how rubber band tension stores potential energy and releases it as kinetic energy — sending small projectiles flying across the room.\u003c\/p\u003e\n\u003cp class=\"\"\u003eWith a removable top that exposes the internal mechanism, you can actually see the crossbow-style action at work as you load and launch. Plot the trajectory of your projectiles and experiment with how adding rubber bands or changing their size affects launch distance and accuracy.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat makes this kit special:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e🏆 Recognized as \u003cstrong\u003eBest in STEM\u003c\/strong\u003e by STEM.org\u003c\/li\u003e\n\u003cli\u003eAncient Greek and Roman ballista design re-interpreted with handheld crossbow mechanics\u003c\/li\u003e\n\u003cli\u003eVisible internal launching mechanism\u003c\/li\u003e\n\u003cli\u003eNo glue required — precision laser-cut wood pieces press fit together\u003c\/li\u003e\n\u003cli\u003eCustomize with paint or markers to make it your own\u003c\/li\u003e\n\u003cli\u003eLaunches pom-pom projectiles safely indoors\u003c\/li\u003e\n\u003cli\u003eBuild multiple kits and let the battles begin\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePerfect for classrooms, science fairs, homeschool physics, birthday parties, and maker enthusiasts. An engaging STEM activity that makes ancient engineering feel as exciting today as it was 2,000 years ago. Recommended for ages 8+.\u003c\/p\u003e\n\u003cp\u003eMade of laser cut birch plywood\u003c\/p\u003e\n\n","brand":"scienceSeeds","offers":[{"title":"None","offer_id":45941249737015,"sku":"SBALBL001","price":40.0,"currency_code":"USD","in_stock":true},{"title":"Bull's Eye","offer_id":45941249868087,"sku":"SBUNBT002","price":55.0,"currency_code":"USD","in_stock":true},{"title":"Emoji","offer_id":45941249802551,"sku":"SBUNBT003","price":55.0,"currency_code":"USD","in_stock":true},{"title":"Plain","offer_id":45941249769783,"sku":"SBUNBT001","price":55.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/0425\/7079\/files\/ballista-best-in-stem_be7d8946-b7b2-488c-94e6-48fd5798b25e.jpg?v=1779463791","url":"https:\/\/scienceseeds.com\/products\/diy-crossbow-ballista-kit","provider":"scienceSeeds","version":"1.0","type":"link"}