The Going Rate for Thoughts
Text only: a price list extending 'a penny for your thoughts' up to the $1 million Millennium Prize for proving the Riemann hypothesis.
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Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-04-26-the-going-rate-for-thoughts/ (CC BY-NC 4.0)Transcript
[Title] "THE GOING RATE"
"A penny for your thoughts / A dime for your conjectures / A quarter for your lemmas / $10⁶ for your proofs of the Riemann hypothesis"