{"product_id":"builder-lab™-motion-machines-balloon-powered-car-lab","title":"Builder Lab™ — Motion Machines (Balloon Powered Car Lab) (STEM.DELUX)","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eEngineers don't just build things. They build, test, and improve. This kit puts your child in that cycle.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eYour child will construct a car powered entirely by air escaping a balloon — then figure out how to make it go faster, farther, and straighter. It's Newton's Third Law in action, and they won't even realize they're learning physics. The kit includes a balloon, straw nozzle, wheels, axles, and a complete lab guide with build instructions, challenge extensions for ages 5–13, and a data-tracking prompt. One build leads to ten experiments.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cem\u003eWhat they'll discover: How air pressure creates motion — and how one small design change can double the distance.\u003c\/em\u003e\u003c\/p\u003e","brand":"SmartHead Co.","offers":[{"title":"Default Title","offer_id":46628242489502,"sku":"SH-STEM-BMM","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0720\/6289\/4238\/files\/Screenshot2026-03-21at9.40.49PM.png?v=1774150858","url":"https:\/\/shop.thesmarthead.com\/products\/builder-lab%e2%84%a2-motion-machines-balloon-powered-car-lab","provider":"SmartHead Co.™","version":"1.0","type":"link"}