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Alhazen's most famous work is his seven-volume treatise on optics Kitab al-Manazir (Book of Optics), written from 1011 to 1021. In it, Ibn al-Haytham was the first to explain that vision occurs when light reflects from an object and then passes to one's eyes, and to argue that vision occurs in the brain, pointing to observations that it is subjective and affected by personal experience.
A Bluetooth earbud, an earphone and microphone that communicates with a cellphone using the Bluetooth protocol. Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission ...
Emission nebula. Planetary nebulae, represented here by the Ring Nebula, are examples of emission nebulae. An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths. The most common source of ionization is high-energy ultraviolet photons emitted from a nearby hot star. Among the several different types of ...
The Three-Body Problem (Chinese: 三体; lit. 'three body') is a story by Chinese science fiction author Liu Cixin, the first novel in the Remembrance of Earth's Past trilogy. The series portrays a fictional past, present and future wherein Earth encounters an alien civilization from a nearby system of three Sun-like stars orbiting one another, a representative example of the three-body ...
Autologous blood therapy, also known as autologous blood injection or autohemotherapy, comprises certain types of hemotherapy using a person's own blood ( auto- + hemo- + therapy ). There are several kinds, the original belonging only to traditional medicine, alternative medicine, and some newer kind of medicine under investigation.
Three-body problem. Approximate trajectories of three identical bodies located at the vertices of a scalene triangle and having zero initial velocities. The center of mass, in accordance with the law of conservation of momentum, remains in place. In physics, specifically classical mechanics, the three-body problem involves taking the initial ...
Mitochondrion. Two mitochondria from mammalian lung tissue displaying their matrix and membranes as shown by electron microscopy. A mitochondrion ( / ˌmaɪtəˈkɒndriən /; [1] pl.: mitochondria) is an organelle found in the cells of most eukaryotes, such as animals, plants and fungi.
