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Higher-quality optical-grade glass materials exist (e.g. Borosilicate crown glasses such as BK7 ( n d = 1.51680 , V d = 64.17 , D = 2.51 g/cm³ ), which is commonly used in telescopes and binoculars, and fluorite crown glasses such as the best optical quality low dispersion glass currently in production, N-FK58 made by the German company Schott ...
Big Mac index, November 2022. The Big Mac Index is a price index published since 1986 by The Economist as an informal way of measuring the purchasing power parity (PPP) between two currencies and providing a test of the extent to which market exchange rates result in goods costing the same in different countries.
Until 2020 Amharic was the sole official language of Ethiopia. [18] [19] [3] [20] [21] The 2007 census reported that Amharic was spoken by 21.6 million native speakers in Ethiopia. [22] More recent sources state the number of first-language speakers in 2018 as nearly 32 million, with another 25 million second-language speakers in Ethiopia. [11]