[micouay]

This supposedly proves that humans are much better tracking social contracts than arbitrary, abstract ones. But I feel like it's actually the wording that makes the puzzle hard. We don't think:

> If somebody is drinking beer, they are 21+.

We think:

> To drink beer, you must be 21+.

And if you formulate the other puzzles in the same way, they are much simpler:

> If a card has a circle on one side, it must have the yellow color on the other side.

Is this your impression too? (Actually, after writing this comment I realised I hadn't checked the red card... But I also hadn't checked the 17 yo lol.)