The speaker in this video makes a comment about evolution I am having some trouble with, suggesting that superfluous characteristics will disappear according to evolution.
If a big proportion of cells never fire then they are superfluous and evolution should have jettison them long ago. [after 03:50]
The problem with this argument is that vestigial features and junk DNA are well known cases of superfluous characteristics that have not disapeared and are used as evidence of evolution, and this article has an interesting take on the situation - http://www.nbcnews.com/science/science-news/beyond-lucy-10-percent-brain-myth-debunked-how-about-junk-n164286.
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