Use this step-by-step STEM science activity after grouping your students in 5 - 6 groups of 3. Project the slides on a Smartboard or whiteboard and challenge them to work together to make the tallest free-standing aluminium tower in the classroom. Competition based and judged. Then have groups talk to other groups and then redesign their tower using what they learned from others and from trial and error. Great activity for Friday afternoon because it will keep students engaged and excited.