Thaum twg Thiab Leej Twg Tsim Cov iav Magnifying

Yeej, tsis muaj cov ntaub ntawv qhia meej txog thaum lub iav tsom iav tau tsim, tab sis nws yeej tsis yog lig tshaj li qhov kawg ntawm lub xyoo pua 13th. Rau ntau txhiab xyoo, tib neeg muaj cov pob zeb ntshiab los yog pob zeb zoo nkauj rau hauv "lens" uas nthuav cov duab. Xyoo 1260, Marco Brock tau piav qhia tias cov neeg Suav hnub nyoog li cas hnav tsom iav thiab nthuav cov font thaum lawv nyeem.