blev

I recently discovered that the algorithm to calculate the day of the week for any given date (e.g. January 1, 2000 was a Saturday) can be easily memorized and, with some practice, one can calculate the day of the week for any date in 5-10 seconds (maybe 2 seconds if you really practice).

What other useful/fun skills can be learned through rote memorization? Bonus points if you can provide a website or app to learn/practice the skill.

I've got a pretty good and short .dev domain and am considering making a new primary email address with it. However, I've previously seen email deliverability issues with a .life domain where emails sent from the domain would silently be ignored (not even sent to spam). I would definitely not want to get burned by that on a personal email. I also intend to create new website accounts so it would be critical that emails get delivered like normal.

Does anyone have experience using this domain for a personal email?