Bees can become mentally young again with just a few simple alterations to their otherwise fixed routines. Because the brains of bees are surprisingly like our own, this trick could help fight dementia and keep human minds young and flexible. Norwegian researcher Gro Amdam had groups of older bees take part in learning and memory tests. The bees were challenged to associate a particular scent with a particular reward, and then be able to remember that association later on. Most of the older bees were able to make the connection, but more slowly than their younger counterparts, and those bees that had symptoms equivalent to human dementia were unable to make the connection at all, suggesting their short-term memory and ability to learn were both in sharp decline.
Here's where it gets interesting. Bee hives have a fairly strict social structure - the older bees leave the hive to collect food, while the younger bees remain inside and care for larvae.