Yuav ua li cas txiav Velcro ntaub? Velcro yog cov nuv-thiab-lub voj ceev ceev tsim los ntawm Swiss Engineer George de Mestal hauv 1940s. Nws muaj ob feem: ib qho "nuv" sab nrog me me, cov khawm txhav, thiab "voj" nrog muag, fuzzy loops. ...
Yuav ua li cas txiav kevlar? Kevlar yog ib hom hluavtaws fiber uas yog cov paub zoo rau nws lub zog zoo tshaj plaws thiab tiv taus kom sov thiab puas. Nws tau tsim los ntawm Stephanie Kwoleke Kwolek hauv xyoo 1965 thaum ua haujlwm ntawm dupont, thiab nws muaj txij thaum ua ...