1. Ecological footprints measure humankind's demands on nature. Using the Internet, estimate the amount of land and water needed annually to support your con- sumption of goods and services and to absorb your wastes. Prepare a memorandum reporting your estimates and listing at least three things you can do to reduce your footprint.

2. One type of prosthetic limb relies on suction to attach to an amputee's residual limb. The engineer must consider the required difference between atmospheric  pressure and  the pressure inside the socket of the prosthetic  limb to develop suction sufficient to maintain attachment. What other considerations are important as engineers design this type of prosthetic device? Write a report of your findings including at least three references.

3. Design a low-cost, compact, light-weight, hand-held, human-powered air pump capable of directing a   stream of air for cleaning computer keyboards,  circuit boards, and hard-to-reach locations in electronic devices. The pump cannot use electricity, including batteries, nor employ any chemical propellants. All materials must be recyclable. Owing to existing patent protections, the pump must be a distinct alternativeto the familiar tube and plunger bicycle pump and to existing products aimed at accomplishing the specified computer and electronic cleaning tasks.