If you're smart, you take the opportunity to teach your kid about the game theory of deception.
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@cjd I like "Surreal Numbers" by Donald Knuth. Used set theory to extend numbers (Courtesy J. H. Conway) and compute answers to 1÷0 (which is distinct from 2÷0 which is again distinct from 0÷0). There a whole math of infinities. (We learned countable, uncountable, and other classifications in school - but never how to compute with infinity.)
