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2. Cataract surgery - Wikipedia

   en.wikipedia.org/wiki/Cataract_surgery

   Cataract surgery, also called lens replacement surgery, is the removal of the natural lens of the eye that has developed a cataract, an opaque or cloudy area. [1] The eye's natural lens is usually replaced with an artificial intraocular lens (IOL) implant.

3. Prism (Katy Perry album) - Wikipedia

   en.wikipedia.org/wiki/Prism_(Katy_Perry_album)

   Prism is the fourth studio album by American singer Katy Perry. It was released by Capitol Records on October 18, 2013. While the album was initially planned to be "darker" than her previous material, Prism ultimately became a prominently dance-inspired record. Perry worked with several past collaborators, while enlisting new producers and ...

4. Down syndrome - Wikipedia

   en.wikipedia.org/wiki/Down_syndrome

   Trisomy 21. Down syndrome (also known by the karyotype 47,XX,+21 for females and 47,XY,+21 for males) [98] is mostly caused by a failure of the 21st chromosome to separate during egg or sperm development, known as nondisjunction. [91] As a result, a sperm or egg cell is produced with an extra copy of chromosome 21; this cell thus has 24 ...

5. Liquid-crystal display - Wikipedia

   en.wikipedia.org/wiki/Liquid-crystal_display

   A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directly [1] but instead use a backlight or reflector to produce images in color or monochrome.

6. Johann Wolfgang von Goethe - Wikipedia

   en.wikipedia.org/wiki/Johann_Wolfgang_von_Goethe

   Johann Wolfgang von Goethe [a] (28 August 1749 – 22 March 1832) was a German polymath, who is widely regarded as the greatest and most influential writer in the German language.

7. List of inventors - Wikipedia

   en.wikipedia.org/wiki/List_of_inventors

   Mikhail Lomonosov (1711–1765), Russia – night vision telescope, off-axis reflecting telescope, coaxial rotor, re-invented smalt; Yury Lomonosov (1876–1952), Russia/UK – first successful mainline diesel locomotive; Aleksandr Loran (1849 – after 1911), Russia – fire fighting foam, foam extinguisher