By Martha Tesema It’s safe to say we’ve reached peak nostalgia. Whether it’s in the music we listen to (“1999” by Charli XCX, anyone?), the shows on Netflix that are all about various decades, or the proliferation of Timehop screenshots and #ThrowbackThursday posts (who hasn’t participated in at least one?), it’s pretty clear: The past is our friend, and we find a lot of joy in taking…