04. Dab tsi yog iav, nws tsim li cas?
Dec 12, 2019
Tso lus
Iav tau tsim los ntawm tib neeg rau txog 4,500 xyoo, thiab nws feem ntau muaj silica (xuab zeb), poov tshuaj lossis dej qab zib, kua qaub, thiab qee zaum muaj lwm yam tshuaj lom neeg.
Lawv tau yaj ua ke thiab txias ntawm huab cua kub kom cov khoom siv yog ib qho nyuaj, tab sis muaj lub ntsej muag du thiab ntws, zoo li kua. Daim ntawv qhia meej rau cov iav pauv hloov ntawm qhov chaw mus rau qhov chaw - cov chemistry thiab cov tswv yim feem ntau kom muab zais tsis pub lwm tus paub.
