OK this is a weird one but hear me out.
Say you're traveling through the multiverse. You find yourself in a universe where something is different. Maybe instead of Hilary Clinton winning the presidency in 2016, it was Donald Trump.
And you wonder "OK, where exactly did my timeline diverge from this one?"
So here's the solution: don't leave your universe without a copy of your local Bitcoin Blockchain. Now you can compare your Blockchain with the local universe's and see (with 10 minute resolution) exactly where they diverged.
No need to trawl through newspaper headlines or whatever… Just check the block headers.
Pretty neat huh?