Half Life is the 2006 debut novel of American writer and artist Shelley Jackson.

The novel presupposes an alternate history in which the atomic bomb resulted in a genetic preponderance of conjoined twins, who eventually become a minority subculture.

Half Life received mixed-to-positive reviews; Newsweek called it "brilliant and funny,"[1] and The New York Times, while praising Jackson's ambition as "truly glorious," added that "All this razzle-dazzle, all the allusions, [and] the narrative loop-de-loops [get] a bit busy.

"[2] It won the 2006 James Tiptree, Jr. Award for science fiction and fantasy.

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