From the excellent xkcd comic - The Difference:

Warning: this comic occasionally contains strong language (which may be unsuitable for children), unusual humor (which may be unsuitable for adults), and advanced mathematics (which may be unsuitable for liberal-arts majors).
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April 2nd, 2008 at 6:33 pm
“Science is a Process, Not a Collection of Facts The essence of science, broadly defined, is that it is a systematic approach to figuring out how the world works…”
July 9th, 2008 at 7:25 pm
From the excellent Piled Higher and Deeper comic strip by Jorge Cham, http://www.phdcomics.com. Like many of the best comics (Dilbert, xkcd)
PhD is authored by an engineer…