Be objective and specific. Gadfly Bite Goes Awry. At the 1995 Northland College Convocation, President Robert Parsonage noted that household machinery such as lawn mowers and chain saws, cause far more pollution, per equivalent time of use, than automobiles. It turns out that Parsonage was right. For a leaf blower, one hour is the equivalent of thirty-four hours of driving, she said.
Light travels faster.
One year to orbit the sun. Definition of molecule.