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Yes. But when they sting you, they do so in order to protect their hive, so when they do, they are remembered and mourned as martyrs. Some colonies of bees in South America have been known to construct small pillars of honeycomb which are never used. In 1997, it was discovered that these pillars correlate with the number of martyr bees in the colony, and it is hypothesized that they are similar to monuments and are also threats to other hives, essentially saying "hey look at how many warriors that have fought for us." This was confirmed the next year when certain colonies were studied and it was evident that the colonies with more of these pillars of honeycomb were usually dominant (confirming that the pillars are a symbol of the hive's might) and more aggressive (confirming that more deaths result in more pillars).
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Bees don't "know" anything. Their tiny brains are sufficient to produce automatic responses to stimuli, but not nearly sufficient to have anything resembling consciousness or knowledge.
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NO!!!!!!!!!! Of course not-insects can't "know" anything! See the microscopic brain?
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Yes.They do.