Nerdy Chicago Weather Joke

From Cheap Talk:

Q: How do you prove the existence of Spring in Chicago?

A: By continuity.

In February it was zero Farenheit. Today it is muggy and approaching 90. By continuity, Spring happened somewhere in between. But note that this existence proof is not constructive. It is of no help in telling us exactly when it was that Spring fluttered by. I must have been sleeping at the time.

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