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Hearing is be-leafing: students invent quieter leaf blower - EurekAlert
<p>The challenge before Johns Hopkins University engineering students: Take a leaf blower, but make it quiet. Make it work as powerfully as ever, but do not allow it to emit the ear-piercing caterwaul that has gotten leaf blowers banned in some communities and cursed in many others.</p> <p>Shocking their sponsors, their advisers and even themselves a little, the students did it.</p>
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