Mackenzie, a researcher and problem solver who must continually justify his existence to his
benefactor, is puzzled about why the things he sends back in time never reappear, but then in
the first story (“Perpendicular Worlds,” Sep 1984 Analog) he starts thinking about
Hawking black holes and Everett parallel worlds, and his work continues in a second story
(“Random Variable,” Feb 1986 Analog) (although I prefer Gribbon’s science
books).
There must be as many different ways in which the world could have got into the state it
is now as there are different ways in which it can develop into the future.
There must be as many different ways in which the world could have got into the state it
is now as there are different ways in which it can develop into the future.
1 English variant