Why would evolution make it so we only use 10% of an organ and still have the 90% with us? We would've just gotten rid of the extra 90% that we don't need and we would walk around with a wallnut in our heads!
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Even "IF" we are just using 10% thank god or "random series of events that made human life possible" that evolution kept the current amount of stuff in our skulls.
That's my point, it doesn't make sense.