Avengers: Endgame exploits time travel and quantum mechanics as it tries to restore the universe
- Written by Michael Milford, Professor, Queensland University of Technology

At the end of Avengers: Infinity War half the people (including heroes and villains) in the universe were gone in the snap of a finger from Thanos (Josh Brolin).
So how can Avengers: Endgame (in cinemas from this week) try to bring them back?
Well, with that tried and tested movie plot device: time...