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Human skin with a sunscreen drawing: in light and ultraviolet radiation. Earth in far ultraviolet radiation; image taken by Apollo 16 commander John W. Young.The auroral belts 13 degrees either side of the magnetic equator can be seen crossing each other on the middle of the right side of the Earth.
In color photography, electronic sensors or light-sensitive chemicals record color information at the time of exposure. This is usually done by analyzing the spectrum of colors into three channels of information, one dominated by red, another by green and the third by blue, in imitation of the way the normal human eye senses color.
The first permanent photograph, a contact-exposed copy of an engraving, was made in 1822 using the bitumen-based "heliography" process developed by Nicéphore Niépce.The first photographs of a real-world scene, made using a camera obscura, followed a few years later at Le Gras, France, in 1826, but Niépce's process was not sensitive enough to be practical for that application: a camera ...
An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal, sexual attraction or libido, although erections can also be spontaneous.
In Islam, any depictions of the body or sexuality, including photography and film, are forbidden as they would be in life. [226] The naked human body was one of the first subjects of prehistoric art, including the numerous female figurines found throughout Europe, the earliest now dating from 40,000 years ago.
In the human body, the central point is the navel. If a man is placed flat on his back, with his hands and feet extended, and a compass centered at his navel, his fingers and toes will touch the circumference of a circle thereby described. And just as the human body yields a circular outline, so too a square may be found from it.
The clitoris (especially the glans) is the human female's most sensitive erogenous zone and generally the primary anatomical source of human female sexual pleasure. [57] Sexual stimulation of the clitoris (by a number of means) can result in widespread sexual arousal and, if maintained, can result in orgasm.
The EIR film became more widely available in 35mm form in the 1960s but has been since discontinued. Infrared photography became popular with a number of 1960s recording artists, because of the unusual results; Jimi Hendrix, Donovan, Frank Zappa and the Grateful Dead all issued albums with infrared cover