I hope you achieve ultimate relaxation ! <| sep |> It actually is possible to farm penguin eggs before they spoil . <| sep |> Shakespeare wrote Hamlet , assuming time travel in a useful form is possible which is unlikely as it would change the amount of information in the universe . I see it as this , first pass through time Shakespeare writes Hamlet . Second pass through time Shakespeare gets give a copy of Hamlet and plagiarizes it . If you think of time like space then the same region of time can be occupied in a different manner , sure you have changed that time but it doesn ' t preclude the initial causality just makes it harder to follow by an observer within the same time frame . Essentially the only difference is that the second pass , after the time traveler has gone back , makes Shakespeare feel like a fraud . It has created a loop in time , the entry point into that loop remains the same despite the conditions being changed causality remains , just only when observed externally does it become visible .