A physicist explains the science of 'Avengers: Endgame

Dr. Clifford Johnson was one of several scientist to advise on 'Avengers: Endgame'

Physics has a beef with Avengers Endgame. Spoilers! - CNET

Physics has a beef with Avengers Endgame. Spoilers! - CNET

Why I Wasn't Bothered by the “Science” in Avengers: Endgame

The Confusing Timeline Of 'Avengers: Endgame' Explained

An 'Avengers: Endgame' science adviser explains what he thinks happened to Captain America at the movie's end

Iron Man talks quantum – Physics World

Clifford Johnson, the Marvel Science Advisor Who Helped Palm Springs – IndieWire

The Science in Avengers: Endgame Explained

Avengers: Endgame' Science Adviser Discusses Time-Travel Theories