The The Atom reference article from the English Wikipedia on 24-Apr-2004
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The Atom

The Atom is a superhero created in 1941 for All-American Comics, and recreated in 1962 in a self-named title, a part of DC Comics's Silver Age of comics.

In his first incarnation, The Atom had no super powers; instead, Al Pratt, initially a college student and later a physicist, is depicted as a tough guy, a symbol of all the short kids who could still make a difference. He would become a member of the Justice Society of America, and, after the atomic age began, would get a new costume.

The new version is physicist Raymond "Ray" Palmer, who created a costume from what was initially depicted as white dwarf star matter, which allows him to shrink down to subatomic size. He is a member of several incarnations of the Justice League. Neither character appears regularly in comics, and even in their heyday were mostly supporting characters.