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- An instrument made of convex glass, used to magnify.
- 2013 September-October, Henry Petroski, “The Evolution of Eyeglasses”, in American Scientist:
- The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone, essentially what today we might term a frameless magnifying glass or plain glass paperweight.
- 2021, Renata Pepicelli, “The Unfinished Transition. The Post-revolutionary Path of Tunisia and the Test of Covid19. A Historical and Socio-Economic Perspective”, in Francesca Maria Corrao, Riccardo Redaelli, editors, States, Actors and Geopolitical Drivers in the Mediterranean: Perspectives on the New Centrality in a Changing Region, Palgrave Macmillan, →ISBN, page 284:
- Faced with this situation, the arrival of the Covid19 pandemic in late winter/early spring 2020 showed the real situation of the country, its fragility and the challenges it faces. Thus, analysis of the impact of Covid19 on Tunisia offers a useful magnifying glass to understand the path of Tunisia from the 2011 revolution to the present.