Christian Lawson-Perfect is a user on mathstodon.xyz. You can follow them or interact with them if you have an account anywhere in the fediverse.

A neat way of separating a deck of playing cards into red and black piles is the one-two trick: move the pack from one hand to the other, taking clumps of one colour or two colours alternately.
Takes at most four runs through to completely separate the colours in a 52-card deck. (Why?)

Christian Lawson-Perfect @christianp

Mad Abel is a card game for wo or more players which involves multiplication in the finite group of your choice: read.somethingorotherwhatever.

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