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Is there a way to "subscribe"/ follow an interesting question without replying to it?
You can click the star icon to tag it as a "favorite", it will then appear on your favorites list on your profile page where you can access them.
I know some users do this, but I personally prefer to just bookmark them.
Every question also has an RSS feed. You can follow in whatever your favorite feed reader is.
For instance, the RSS feed for this question is