In 2009, the National Commission on Teaching and America's Future reported that in 18 states, including Connecticut, more than an half of the public school teachers were 50 or older, with the average teacher retirement age that year at 59.
Leaf blowers are available in cordless, gas, and electric-powered models. Cordless Featuring rechargeable batteries, cordless models are ideal for use in tight spaces where you need freedom to move or for small yards.
Among positive displacement blowers, the Roots, or rotary lobe, type is common, which uses two counter-rotating lobed rotors to move fluid through the blower, much the way a gear pump moves oil or other viscous liquids. A cutaway blower (below) shows one of the two rotors.