Constructions correspond to replicators or memes in memetics and other cultural replicator theories. Replicator Carter however never returned his feelings, believing him unfit to command the Replicators. Memes are true evolutionary replicators like genetics and undergo evolutionary change. They are unaware of transporters and replicators until their first meeting with "Voyager"'s crew. Other pre-RNA replicators have been posited, including crystals and even quantum systems. Kaku discusses programmable matter, quantum computers, carbon nanotubes, and the possibility of replicators. No fossil evidence has been discovered for ultramicroscopic intracellular replicators such as viruses. Orilla is rich with neutronium, which would allow the construction of many Human-form Replicators. Thor deploys the weapon, destroying the remaining replicators. HighLife is best known for its frequently occurring replicators. They are most often considered as just replicators rather than forms of life. He proposed three large-scale applications of machine replicators. It is a concept of linguistic units as replicators. It works by blocking the cohesion between the blocks that make up the Replicators. Hull suggested a resolution based upon a distinction between replicators and interactors.