Kungani abantu bezithanda izinja?
Abantu bayazithanda izinja ngoba ziye zathuthuka ndawonye okungenani iminyaka engu-18.000. Phakathi nalesi sikhathi, izinja ziye zafunda ukubona nokuqonda amazwi abantu ayinkimbinkimbi, kuhlanganise nezimpawu zobuso nolimi lomsindo. Ngokulandelayo, i-physiology yenja kanye nokuthuthuka kwengqondo kuye kwaguqula amasethi emisipha yobuso kanye namazwi kanye namakhono okuxhumana okuqonda okubenza bakwazi ukuxhumana nezimo zabo zokuba khona ngokomzwelo nangokomzimba.