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Cataract surgery is the removal of the natural lens of the eye that has developed a cataract, an opaque or cloudy area. The eye's natural lens is usually replaced with an artificial intraocular lens (IOL) implant. Learn about the causes, symptoms, diagnosis and methods of cataract surgery.
A liquid-crystal display (LCD) is a flat-panel device that uses liquid crystals and polarizers to modulate light. LCDs are widely used in various applications, such as TVs, computers, watches, and mobile phones.
A comprehensive biography of the German polymath and writer, who is widely regarded as the greatest and most influential writer in the German language. Learn about his life, works, achievements, and legacy in various fields of literature, science, and politics.
A double play in which the pitcher (1) fields a batted ball and throws home to the catcher (2), who retires a runner advancing from third. The catcher then throws to the first baseman (3) to force out the batter.
A comprehensive list of notable inventors from various countries, fields and periods, with brief biographies and inventions. Find out who are credited with inventing the television, the computer, the laser, the zipper and more.
CRISPR is a technique to modify the genomes of living organisms by using a bacterial enzyme called Cas9 and a synthetic guide RNA. It can be used for various purposes in biotechnology and medicine, but also raises ethical concerns.
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