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High-index: 1.60 ≤ n d < 1.74; Very high index: 1.76 ≤ n d; This is a general classification. Often for marketing purposes, materials with n d values that are at or above 1.60 can be referred to as "high-index". Likewise, Trivex and other borderline normal / mid-index materials may be referred to as mid-index.
Flint glasses are arbitrarily defined as having an Abbe number of 50 to 55 or less. The currently known flint glasses have refractive indices ranging between 1.45 and 2.00. Traditionally, flint glasses were lead glasses containing around 4–60% lead(II) oxide ; however, the manufacture and disposal of these glasses were sources of pollution .
[50] [51] In 2024 and 2025, several large American companies scaled back or ended their DEI programs and, in some cases, related policies, such as participation in the Corporate Equality Index . These included Walmart , Meta , Amazon , McDonald's , Ford , Lowe's , Harley-Davidson , John Deere , Tractor Supply and PBS . [ 52 ]
Wages in the U.S. were typically between 30 and 50 percent higher than in Britain. Women factory workers were especially scarce. The elasticity of labor was low due in part to a lack of transportation and low population density. [70] The relative labor scarcity and high price was an incentive for capital investment, particularly in machinery. [71]
Vision Corporation and Miros Inc were founded in 1994, by researchers who used the results of the FERET tests as a selling point. Viisage Technology was established by a identification card defense contractor in 1996 to commercially exploit the rights to the facial recognition algorithm developed by Alex Pentland at MIT .
Google's 2020 diversity report states that 32 percent of its workforce are women and 68 percent are men, with the ethnicity of its workforce being predominantly white (51.7%) and Asian (41.9%). [258] Within tech roles, 23.6 percent were women; and 26.7 percent of leadership roles were held by women. [ 259 ]