🔧 Revise, Retest, Recalculate

Teams implement targeted fixes to the prototype, then retest using the same measures from day 11 so results are comparable. Midway through class, teams give feedback to 2 peers, receive feedback, and revise by checking whether the prototype, poster draft, and explanation make the math and sound behavior understandable. By the end, each team adds before-and-after evidence, trade-offs, and next-step notes to its engineering story.