[king_magic]

And that's cool and all, but - again:

  The single most impactful thing you can do to boost your intelligence is learn how to effectively self-soothe

That's a pretty big statement to make. The single, most impactful thing, eh? Reaaaaallly?

I don't doubt that there might be some scientific background, particularly for folks with sensory processing disorders - but to phrase this like the author did - as though it applies to general intelligence for pretty much anyone - just feels very intellectually dishonest.