Artifact, named for its external resemblance to the Bohr model of the atom. The visually observable rotation only adds points to the successful choice of name.\n\n However, scientists are little interested in this superficial resemblance. They are more intrigued by the unusual property of the artifact's fragments, which causes all its parts to try to return to their positions even when an attempt is made to separate them.\n\n A stalker who decides to stop the rotation of a part of Atom with his bare hands risks not only breaking bones but also receiving a puncture wound.