 Khabiirkan jaamacada University Of Southern California, oo ka hadlayay natiijada ka soo baxday cilmi baadhistii ay ku sameeyeen Soonka, ayaa yidhi, Muddo dheer aadamigu waxay raadinayeen, inay helaan, hab isku dheeli tiran oo ay ku ilaaliyaan caafimaadkooda, isla markaana kaga badbaadaan cudurada halista ah iyo dhibaatooyinka caafimaad daro ee sababta u ah, cimri deg deg iyo caafimaad darada is huwan. 