The Cognitive Trade-Off Hypothesis

Did you know that years ago
 All we had was sticks and stones?
 To make our food and build our homes
 We collected birds and we lived in holes
 And most of us lived in the trees
 We counted things at incredible speeds
 We lived a life of simplicity
 And eating on bugs and little berries
 We climbed down from the trees and we learned to speak
 We lost all of the hair from our bodies
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 Our ancestors were very weak
 The other chimps kicked 'em out of the trees
 And they were forced to learn how to speak
 In exchange for other important things
 But once on the ground, we were exposed
 To lions and tigers and predators
 So we learned to speak, to share our strategies
 On how to survive as naked monkeys
 We climbed down from the trees and we learned to speak
 We lost our detailed short-term memories
 But what's all of this got to do with me?
 Is there some sort of connection to my ADD?
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 We climbed down from the trees and we learned to speak
 We lost our detailed short-term memories
 But what's all of this got to do with me?
 Is there some sort of connection to my ADD?
 We climbed down from the trees and learned to speak
 We lost all of our cognitive abilities
 We climbed down from the trees and learned to speak
 We lost all of the hair from our bodies