For me, r/k selection applied to human behavior broke my mind.

Once you see it, you can't unsee it. Be it dating or comparing cultural approaches to relationships, etc.

Can you expand on that?

The very short gist of it is a trade-off between (low quality, high quantity) and (high quality, low quantity).

R-selection: emphasis on high numbers / growth.

K-selection: emphasis on high quality.

Just to expand upon this in HN terms:

- R-selection is just a confusing bit of technojargon, really what we're talking is a zerg style build strategy, lots of units for cheap, as far as our organism in the game of life. So organisms with this build strat will raid an ecological niche like it's 2021 and Biden just unlocked the border

- K- selection, another confusing bit of technojargon (K stands for konfusing here), is more of a protoss build, not nearly as many units but higher quality. this is for scenarios where a raid won't work, kind of like a buffed commando type unit in command and conquer

Quantity has a quality of its own.