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2. Aspect ratio (image) - Wikipedia

   en.wikipedia.org/wiki/Aspect_ratio_(image)

   Common aspect ratios used in film and display images. The common film aspect ratios used in cinemas are 1.85:1 and 2.40:1. [1] Two common videographic aspect ratios are 4:3 (1. 3:1), [a] the universal video format of the 20th century, and 16:9 (1. 7:1), universal for high-definition television and European digital television.

3. Mesh (scale) - Wikipedia

   en.wikipedia.org/wiki/Mesh_(scale)

   Equivalent mesh sizes from 5 μm to 25.4 mm also exist. [1] [2] [3] Available sieve sizes are usually regulated by standards. Those in common use are ISO 565:1990 and ISO 3310-1:2000 (international), [4] EN 933-1(European) [5] and ASTM E11:01 (US). EN standards are available with national 'badging'; so they appear as BS EN, FR EN, DE EN, etc.

4. Visual acuity - Wikipedia

   en.wikipedia.org/wiki/Visual_acuity

   [4] [5] The decline is according to E 2 /(E 2 +E), where E is eccentricity in degrees visual angle, and E 2 is a constant of approximately 2 degrees. [ 4 ] [ 6 ] [ 7 ] At 2 degrees eccentricity, for example, acuity is half the foveal value.

5. G.722 - Wikipedia

   en.wikipedia.org/wiki/G.722

   G.722 is an ITU standard codec that provides 7 kHz wideband audio at data rates from 48, 56 and 64 kbit/s. This is useful for voice over IP applications, such as on a local area network where network bandwidth is readily available, and offers a significant improvement in speech quality over older narrowband codecs such as G.711, without an excessive increase in implementation complexity.

6. Mandelbrot set - Wikipedia

   en.wikipedia.org/wiki/Mandelbrot_set

   Images of the Mandelbrot set exhibit an infinitely complicated boundary that reveals progressively ever-finer recursive detail at increasing magnifications; mathematically, the boundary of the Mandelbrot set is a fractal curve. The "style" of this recursive detail depends on the region of the set boundary being examined.

7. Euro - Wikipedia

   en.wikipedia.org/wiki/Euro

   The share of the euro as a reserve currency increased from 18% in 1999 to 27% in 2008. Over this period, the share held in U.S. dollar fell from 71% to 64% and that held in RMB fell from 6.4% to 3.3%. The euro inherited and built on the status of the Deutsche Mark as the second most important reserve currency.

8. Metropolitan statistical area - Wikipedia

   en.wikipedia.org/wiki/Metropolitan_statistical_area

   In the United States, a metropolitan statistical area (MSA) is a geographical region with a relatively high population density at its core and close economic ties throughout the region.

9. Betelgeuse - Wikipedia

   en.wikipedia.org/wiki/Betelgeuse

   By January 2020, Betelgeuse had dimmed by a factor of approximately 2.5 from magnitude 0.5 to 1.5 and was reported still fainter in February in The Astronomer's Telegram at a record minimum of +1.614, noting that the star is currently the "least luminous and coolest" in the 25 years of their studies and also calculating a decrease in radius. [67]