This difficulty is enhanced by the fact that not all church - going Canadians are
suitable date material: in truth, many of those who do attend church are already in relationships, married or in significantly different age brackets.
Nevertheless, as Tobias says, it is still ``... a field beset with relatively few facts but many theories... The story of early hominid brains has to be read from carefully
dated, well identified, fossilised calvariae, or from endocranial casts formed within them... Such
materials confine the Hercule Poirot, who would read «the little grey cells» of fossil hominids, to statements about the size, shape and surface impressions... of ancient brains...» The other major limiting factor at the moment is the lack of
suitable fossil skulls for such studies.