This human-powered vacuum pump was developed by SP.723 students on the Vac-Cast project for use in rural clinics. Using the pump, technicians can make a mold in sand around an amputated limb, to quickly and cheaply cast a fitted prosthesis. This technology won $7,500 funding in the '06-'07 MIT IDEAS Competition. (Image courtesy of Vac-Cast Project: Tess Veuthey, Goutam Reddy, Irina Azu, Maria Luckyanova, Aron Zingman, and Stephen Samouhos. Used with permission.)