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Detail from The Extraction of the Stone of Madness, a painting by Hieronymus Bosch depicting trepanation (c. 1488–1516). Trepanning, also known as trepanation, trephination, trephining or making a burr hole (the verb trepan derives from Old French from Medieval Latin trepanum from Greek trúpanon, literally "borer, auger"), [1] [2] is a surgical intervention in which a hole is drilled or ...
The pearl organ is associated with a secondary retina, allowing the fish an unusually wide field of view. [2] Specifically, pearleyes can see up to 20 degrees below the horizontal despite the nearly 40-degree angle created by the tubular eyes of the pearleye above the horizontal. [ 3 ]
It reflects like a mirror revealing the pupil of your eye. Subtly it picks up the tip of an autumn hair. It brightly illuminates the dark and obscure. Thus the jade disk of Mr. He [和氏之璧] and the pearl of the marquis of Sui [隨侯之珠] emerged from the essence of a mountain and a spring. When the Superior Man wears them, he complies ...
A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as a conulariid.Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) [1] in minute crystalline form, which has been deposited in concentric layers.
Diagram of the eye highlighting the retina, vitreous humor, and other key structures. The retina is a thin layer of tissue located at the back of the eye. [1] [5] It processes visual information and transmits it to the brain. [5] Retinal detachment occurs when the retina separates from the layers underneath it. [2]
Scientists confirm an 8,200-solar-mass black hole in the Omega Centauri cluster using 20 years of Hubble data, shedding light on black hole formation and evolution.