'Izikhwama zezandla zonkulunkulu' ezingaqondakali ezitholakala emifanekisweni yasendulo emhlabeni wonke: Yayiyini injongo yazo?
Impucuko yasendulo ehlukaniswe cishe amakhilomitha angu-12,700, ukusuka eSumer kuya eMesoamerica, yabonisa isikhwama esingaqondakali sonkulunkulu. Ingatholakala emifanekisweni eqoshiwe yaseSumerian kanye nezithombe ze-bas-relief ezisukela emuva...