Kodi Kevlar ndi chiyani? Kevlar (para-aramid) ndi ulusi wolimba komanso wosatentha, wogwirizana ndi ma aramid ena monga Nomex ndi Technora. Yopangidwa ndi Stephanie Kwolek ku DuPont mu 1965, zinthu zolimba kwambirizi zinayamba kugwiritsidwa ntchito m'mabizinesi kumayambiriro kwa zaka za m'ma 1970 ngati...
Mu dziko lomwe luso la zida zakunja lingapangitse kapena kusokoneza ulendo, kukhala ndi wopereka wodalirika wa zingwe ndi zingwe zodalirika ndikofunikira. Chingwe cha Shengtuo, chokhala ndi zaka 16 zogwira ntchito yopanga zingwe ndi zingwe...