You can rewind time but you don't remember the future

You will remember that you rewound time but you won't know why and you can't remember future events.

So you can't go back to 2009 and invest in bitcoin. This might be useful academically because a week before the test you'll know that you went back since you didn't study enough. Might actually be very eerie since you know something's about to happen but you don't know what.

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