The titular "androids" of Andre Norton's Android at Arms aren't. Nor are they the originals they start out thinking they are. They are actually clones created by the mysterious operators of their prison planet, who accidentally rediscovered a science so long forgotten (and forbidden?) that even the name for it had been lost. Realistically, there is no other way that both Andas Kastor and the older ruling self he finds in power when he gets back to Inyanga can both be - as they quite explicitly are - fully human.