Erg and Ugh 
Copyright 2006 by Paul Niquette, all rights reserved.
Adapted from A Certain Bicyclist
he year was 1951, late in September.  The place: a classroom at El Camino College in Lawndale, California.  Returning from lunch, the instructor for Physics 1A, Thomas Wilson, found what you see depicted below on his blackboard and smiled.

What is your explanation?

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