The futility of time travel
experiment #02014004220000 +... ·

 

What happens when you place an order with a business that no longer exists? What happens when you respond to an advertisement in a magazine you remember from your childhood?

Some letters disappear. Some letters come back, marked "Return to sender". Some letters generate a reply. It's all very unpredictable. This mode of time travel appears to be unreliable and, quite possibly, futile.