Boom! Crash! This sky-high Mega Smokestack is old and outdated. Kids build this 91 cm tall towering structure then demolish it with the powerful quad-blaster, taking out four walls at once. Young demolition scientists will learn about energy, momentum, and gravity. What’s the quickest way to knock the building down? What’s the safest way? Which way scatters the least debris? Which one does the most?!