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But when cognitive science turned its back on behaviourism more than 50 years ago and began dealing with signals and internal maps, goals and expectations, beliefs and desires, biologists were torn. All right, they conceded, people and some animals have minds; their brains are physical minds - not mysterious dualistic minds - processing information and guiding purposeful behaviour; animals without brains, such as sea squirts, don't have minds, nor do plants or fungi or microbes. They resisted introducing intentional idioms into their theoretical work, except as useful metaphors when teaching or explaining to lay audiences. Genes weren't really selfish, antibodies weren't really seeking, cells weren't really figuring out where they were. These little biological mechanisms weren't really agents with agendas, even though thinking of them as if they were often led to insights.