I know what you're saying, but that isn't the question. The question is "what makes us human" or some similar ridiculousness. // Having said that, come on. Th

I know what you're saying, but that isn't the question. The question is "what makes us human" or some similar ridiculousness. // Having said that, come on. There is a correlation between brain size (i.e. number of neurons) and intelligence. It may not be 1:1 or linear (though how do you know the Neanderthals were not more more intelligent, or we aren't twice as intelligent as elephants?) but there is most certainly a strong strong correlation.