All of modern mathematics is built on the foundation of set theory, the study of how to organize abstract collections of objects. But in general, research mathematicians don’t need to think about it ...

A copy of the first ever issue of “Superman,” discovered in a Californian attic last year, has become the most expensive comic ever sold, fetching $9.12 million at auction. Three brothers from ...

The Man of Steel still resonates with collectors. A copy of Superman No. 1, the 1939 comic book that featured the superhero in his first solo title, sold for a record $9.12 million on Thursday in an ...