Naturally occurring caffeine in certain types of nectar helps increase learning in bees and makes them more likely to return -- a discovery that helps scientists better understand the relationship between plants and their pollinators, according to a report published in the journal Science. "The trick here is actually to influence the memorability of the signal using a psychoactive drug. And that's a new trick in the book for plants," said Lars Chittka, a researcher at Queen Mary, University of London, who did not participate in the study.

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