Every snapshot is a moment you can go back to and look around. Looking changes nothing, so you can't break anything here.
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The command is git checkout with a snapshot ID. Git calls this a detached HEAD, which sounds like a horror movie. It only means you're looking at an old snapshot instead of the newest one.
Things got weird last night. Snapshot 5 put 10 cups of salt in the cookies, and nobody knows how. First, visit a simpler time, before cookies existed.