Many mythologies mention some form of "giants". Those giants may or may not be described as greater in height, but are always described as greater in strength and are portraied as violent. Examples are the Greek "gigantes" or the Biblical "Nephilim".
Has there ever been any scientific study, on whether those myths could hint to contact of ancient, yet anatomically modern human, people with another species of the genus Homo? Could it be that other species of Homo have had a bigger physiognomy (e.g. as described for the Homo ergaster)? Is there a theory, that over the centuries, contacts with such a species in ancient times could lead to the myths we read today?