"Proposed", "suggest" versus "know"...Evolution vs knowledge (science)...

It is subtle but when you see it, it becomes clear that so-called evolutionary science is not science at all but more of a proposition...

Always look for the words of "we believe...suppose...porpose..., etc, etc..." in order to weed through what is genuine knowledge (science) and what is fanciful speculation...

i.e. from this article: ..."researchers have proposed" and "suggest"...

Large human brain evolved as a result of ‘sizing each other up’ : http://www.psypost.org/2016/08/large-human-brain-evolved-as-a-result-of-sizing-each-other-up-44354