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Rubes: Learning to Fly

a bird explaining Newton's Third Law of Motion and how it relates to flight.  The other birds don't understand.  The instructor finally says

[greybox] A bird explaining Newton’s Third Law of Motion and how it relates to flight.  The other birds don’t understand.  The instructor finally says “Just flap.”   [/greybox]

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(c) 2007, Leigh Rubin, Syndicated Cartoonist