Neuroscientists found that voluntary forgetting happens through not-remembering as well as through remembering something else; other neuroscientists replaced subjects’ memories of enjoying cocaine with less exciting ones. Shy rainbow trout have longer memories for the odor of predators than do bold trout, and bees shaken awake every five minutes as they try to sleep will not remember a new route home. New Zealand registered two new species of forget-me-not. Superb fairywren mothers teach their eggs a password that the newly hatched chicks must use when demanding food, and sleeping baby rats’ whiskers were found to twitch even before the…