A photo showing the thickness of an approximately 40 page-long homework assignment calculating the Klein-Nishina formula.
https://files.mastodon.social/media_attachments/files/109/467/344/949/027/092/original/33165683c2f1d1dd.jpeg
It's a lovely calculation that has since taught generations of particle physics students the difference between a long homework assignment and a very long homework assignment. This one clocked in at around 40 pages.
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