I’m not a parent, but going by pop culture, it seems like literally every child has the same fears.
In pre-modern times, I imagine that they’d be sleeping in the same room as the parents, but if modern notions of privacy don’t permit that, seems we could at least design an enclosed capsule or something.
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Similar goes for picky eating. Few things are tasty by default, but most tastes are acquired by repeated exposure to new cuisine.
I’m still getting used to clams, snails, slugs, and calamari. Went from gag reflex and unable to swallow to capable of eating but not savouring in a few months time.
And again with fears, it’s not that dark voids have become less dangerous or fearful, it’s just that I have checked enough voids to not be immediately alarmed.