It's peak HN meme material because 1) it (allegedly) affects your intelligence which everyone here values highly 2) you can measure it, it's a number 3) requires tech to measure it

So perfect for HN, you can obsess over numbers and tech and how to measure it endlessly and overhype the significance to trick yourself into thinking you're doing something useful.

You get to have your cake and eat it, no wonder everyone loves this topic.

(Also if you're a doomer type you can link this in with rising atmospheric co2 levels for extra points)

Also this is finally a great reason to order a dozen Arduinos + sensors for a domestic IoT project.