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Refractive surgery. Refractive surgery is optional eye surgery used to improve the refractive state of the eye and decrease or eliminate dependency on glasses or contact lenses. This can include various methods of surgical remodeling of the cornea ( keratomileusis ), lens implantation or lens replacement.
A telescope in the Very Large Telescope system producing four orange laser guide stars A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.The word laser is an anacronym that originated as an acronym for light amplification by stimulated emission of radiation.
The Tre Cime di Lavaredo ( Italian for 'Three Peaks of Lavaredo'; pronounced [ˌtre tˈtʃiːme di lavaˈreːdo] ), also called the Drei Zinnen ( German for 'Three Merlons '); pronounced [ˌdʁaɪ ˈtsɪnən] ⓘ ), are three distinctive battlement -like peaks, in the Sexten Dolomites of northeastern Italy. They are one of the best-known ...
Lidar (/ˈlaɪdɑːr/, also LIDAR, LiDAR or LADAR, an acronym of "light detection and ranging"[1] or "laser imaging, detection, and ranging"[2]) is a method for determining ranges by targeting an object or a surface with a laser and measuring the time for the reflected light to return to the receiver. Lidar may operate in a fixed direction (e ...
Leonardo di ser Piero da Vinci [b] (15 April 1452 – 2 May 1519) was an Italian polymath of the High Renaissance who was active as a painter, draughtsman, engineer, scientist, theorist, sculptor, and architect. [3] While his fame initially rested on his achievements as a painter, he has also become known for his notebooks, in which he made ...
Greta Tintin Eleonora Ernman Thunberg (Swedish pronunciation: [ˈɡrêːta ˈtʉ̂ːnbærj] ⓘ; born 3 January 2003) is a Swedish environmental activist known for challenging world leaders to take immediate action for climate change mitigation.[1] Thunberg's climate activism began when she persuaded her parents to adopt lifestyle choices that ...
Amyotrophic lateral sclerosis ( ALS ), also known as motor neurone disease ( MND) or Lou Gehrig's disease in the United States, is a rare but terminal neurodegenerative disorder that results in the progressive loss of both upper and lower motor neurons that normally control voluntary muscle contraction. [3] ALS is the most common form of the ...
