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With donated and discounted building materials, and cash contributions from sponsors, Habitat helps families who need housing, and who commit to working shoulder-to-shoulder with community volunteers throughout the construction of their homes. In Tucson, Arizona, for example, single-parent families must agree to donate 200 hours of labor on the building or in the Habitat office; two-parent families must donate 400 hours of sweat equity, says Yvonne Coelet, Director of Public Relations.Houses are priced affordably and the families who move in are given zero-interest loans. The interest-free loans and community underwriting of the project through volunteer labor and donated materials means home payments for the new residents are typically much lower than the lawn rent payments they were making previously. In Tucson, families living in rental units pay at least $.500 per month. In contrast, house payments for Habitat homes are typically about $350 per month. "With a house payment that''s significantly lower than rent," says Coelet, "families can get ahead in life."

"Even a small leak of one drop per second results mower in a spill of more than 600 gallons of gasoline per year," says Tom Blewett, codirector of the Solid and Hazardous Waste Education Center at the University of Wisconsin.However, as dangerous as these compounds are, they pale in comparison to the environmental impact ratings of MTBE. This controversial gasoline additive has been used since 1979 to meet reduced-emissions requirements in all or part of 17 states. Water quality surveys have recently begun finding MTBE at alarming rates.

Danger comes from the fact that centrifugal force does not increase in direct proportion to an increase in speed, but instead it increases as the square of that speed increase. When rotational speed doubles, centrifugal force quadruples. This effect means that relatively small changes in speed can produce significant increases in force. In the example mentioned, changing from 6,600 rpm to 7,700 rpm multiplies the speed by 1.167. However, the corresponding centrifugal force would multiply by a factor of 1.167 x 1.167, or 1.36. To take a more extreme example, consider the same wheel with a maximum safe operating speed of 6,600 rpm run on a 5-inch right angle grinder at 10,000 rpm. This represents an over-speed of about 1.5 times the wheel''s designed speed. But the corresponding centrifugal force-and the corresponding rotational stress on the wheel-would be about 2.3 times as much as the maximum allowed.