Question.. There is popular common belief that man uses only 10 to 15 % of the brain..
But from an natural selection evolutionary viewpoint you would not evolve something that is not used.
One or the other should not be true
Sometimes something unused is a natural consequence of implementing something useful. However a large intestine comes to be, the appendix may very well be an unavoidable result.
Sometimes something we think unused actually has an active purpose we just don’t understand yet. Turns out the appendix does have a purpose after all, we just didn’t grasp why until recently.
And sometimes something may evolve by chance, not beneficial but not detrimental either, having no reason to be de-selected out of existence.
Too much of ID argumentation amounts to “I don’t see why/how X exists, therefore it’s wrong/nonexistent”. Too much insistence on having perfect knowledge on both sides, too little humility that 2.5 pounds of wet brain cells just a few decades old is not well suited to understanding billions of light-years of content.
That just applies to teenagers.
“There is popular common belief that man uses only 10 to 15 % of the brain. But from an natural selection evolutionary viewpoint you would not evolve something that is not used. One or the other should not be true”
And the popular common belief is the one that’s not true: Humans Already Use Way, Way More Than 10% of Their Brains - The Atlantic
http://www.theatlantic.com/technology/archive/2014/07/you-already-use-way-way-more-than-10-percent-of-your-brain/374520/
(Actually, it’s not really true that you wouldn’t evolve something that’s not used. It appears that some traits just “come along” with other useful ones—i.e., if you evolve the useful A, you get the meaningless B.
“There is popular common belief that man uses only 10 to 15 % of the brain..”
If there is a popular common belief that kissing frogs causes warts, does that make it scientific?