The Adam Series was a group of identical male human clones designed to have superior intelligence and strength. A similar series was developed at the same time for human females, this group the Eve Series of clones.
The Eve and Adam series and the associated research was part of the Lichfield Experiment. This was a top secret eugenics experiment devised by the US during the Cold War to respond to military intelligence reports that the Soviet Union had already developed a similar program to breed better scientists/warriors.
Both the Adam and Eve series had 56 chromosomes instead of the usual 46. Chromosomes 4, 5, 12, 16 and 22 were duplicated to allow for additional genes for heightened intelligence and strength. But with this came homicidal and suicidal tendencies and extreme psychotic behaviour; causing the project to be abandoned (TXF: "Eve").