In previous studies, physics students at the University of Leicester have concluded Batman has a fatal flaw in his flying cape which would prevent him from landing safely. They also concluded that a lot more than 501 seagulls would be needed to help Roald Dahl's James fly his Giant Peach.
But they did conclude that one of Spider-Man's feats of strength rang true.
In the second of the movie blockbusters starring Tobey Maguire as the comic book hero, Spider-Man uses his web to stop a runaway train. And this is possible, say the boffins.