I thought this was very interesting. I never realized how many plants included caffeine in their nectar. This article purports that it is up to 40% of plants
http://phenomena.nationalgeographic.com/2015/10/15/how-plants-manipulate-bees-with-caffeine/
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Yes I read that one - You might say they get a Buzz out of it 
The humans fall for the sweet, sweet rush of caffeine, even at the expense of finding the best food. 
Not this human… makes me jittery and throw-uppey. I guess I am pretty amped already, don’t need any help. 