Turn up your computer's speakers if you want to really experience the homepage of Discover Engineering, as it has some rollicking music and graphics to emphasize how exciting engineering can be. Roller coaster design, the biomechanics of skateboarding, solar cooking, purifying water, and creating virtual computer worlds all involve engineering, and this site has "video activities" to explain them all. Visitors can check out the great video called "Extreme Enough", about a California skateboard shoe company that is using engineering to design skate shoes that "absorb impact and minimize injury" to skaters when they wipe out. The video activity entitled "Engineers for a Sustainable World" shows visitors how engineering is used to create water filtration systems for people who have access to only dirty water, in remote villages and rural areas. At the University of Iowa, local, unclean river water is used to demonstrate how a filtration system, much to the amazement of the three student participants, can make the river water fit to drink.