Which of the following is NOT listed as a parameter of this engineering design challenge? The materials must be reusable or recyclable. The materials must include aluminum foil. The temperature must increase by at least \( 10^{\circ} \mathrm{C} \). All materials must cost less than \( \$ 10 \).

One parameter that is often emphasized in engineering design challenges is sustainability, making it popular for projects to include reusable or recyclable materials. This encourages innovation while reducing environmental impact, highlighting how eco-friendly practices can be integrated into everyday engineering solutions. In real-world scenarios, like product design or packaging, the budget constraint—like the $10 limit mentioned—taught engineers to become resourceful. Cost-effective designs not only make projects feasible but also prepare budding engineers for the financial considerations that businesses navigate daily. Balancing performance with budget is a vital skill in engineering!