Caffeine improves the memories....

of Bees! 

In laboratory tests, bees were more apt to remember the location of  flowers which had low concentrations of caffeine in their nectar. The caffeine acted as a memory stimulant in the bees. 
This 'drugging of the Bee' is beneficial to the plant - causing it to bear more fruit and seeds. Plants which produce caffeine laced nectar are coffee plants and citrus plants.

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