Current procrastination level: I just did surgery on a computer mouse. Took it apart and removed a load of fluff and it works again. Seems like the mouse wheel works by registering the passing of spokes with a tiny laser. Fascinating! Back to prepping teaching? Sigh. 

 @2b4a17d7 I bought myself some work clothes for days like this.

https://openbiblio.social/system/media_attachments/files/111/132/454/148/546/410/original/68351b362096d2b3.jpg