They are a great source of learning & discovering new things & literally cost nothing (except my time & some stress when lots of unread ones pile up my inbox).
Here're some good ones to add new flavours to your reading list.
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Dan Lewis's "Now I know" shares one good story covering interesting facts, events and some absurdities.
They are fun, refreshing and make you go wow every time.
If you're the curious kind who appreciates learning new things for the joy of it, go for it.