Googling an issue and finding an old Stack Overflow question you've answered. Thanks, past me, but please be more thorough next time!
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In my blog post about Emacs keybindings https://www.wilfred.me.uk/blog/2018/01/06/the-emacs-guru-guide-to-key-bindings/ I mention the 'Emacs Guru Test'.
It's a cute way of seeing how well you know Emacs, so I'm pleased to have shared it. I didn't invent it though. My googling has totally failed to find the original author.
I'm amused that googling for Linux kernel commit hashes actually works.
Argh, Python's PIL has disappeared from PyPI. Googling suggests this has happened before, and Pillow is superseding PIL anyway.