If there are any comic book fans out here, this is just adorable:

http://www.nature.com/nsu/020218/020218-17.html

There is something abnormal about Spider-Man's friends. Admittedly, the
Human Torch, Ant Man and Wonder Man aren't exactly your average citizens,
but Spanish scientists have uncovered a more subtle distinction between
the realm of Marvel comics and the real world.

The web of superhero interactions, woven without any master plan by the
Marvel writers over 40 years, has tell-tale differences from real social
networks, say the researchers1. Inventing a universe is harder than you
might think.

[...]