Your group settled on a plan for the science challenge, led by the most confident kid in the class. Everyone agreed quickly because, well, they seemed to know what they were doing. But as you've gone along, you've started to notice the plan isn't working. The thing you're building keeps falling over. You think you can see why — and you've got a different idea that might fix it. The problem is, everyone's already committed, the confident kid is sure it'll come together, and speaking up means questioning the person in charge in front of everyone. You could stay quiet and let it fail. You could mutter to yourself afterwards that you "knew it." Or you could say the awkward thing: "I don't think this is working — can I show you something?"