Mid ka mid ah cilmi baarayaasha, Mary Renfrew, oo ka socota jaamacadda Dundee, ayaa sheegtay: "Aad ayey u adag tahay in dumarka ay caruurta nuujiyaan ayagoon haysan qoys iyo bulsho adag oo taageeraya, taasina waxaa ugu wacan caqabadaha bulshada haysta.
