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3–6 million per year (US) [1] [3] Conjunctivitis, also known as pink eye, [4] is inflammation of the outermost layer of the white part of the eye and the inner surface of the eyelid. [5] It makes the eye appear pink or reddish. [1] Pain, burning, scratchiness, or itchiness may occur. [1] The affected eye may have increased tears or be "stuck ...
Eye color. The irises of human eyes exhibit a wide spectrum of colours. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye 's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [3] : 9. In humans, the pigmentation of the iris varies ...
Evil eye. A person from Cairo, reputed to possess the evil eye. The evil eye is a supernatural belief in a curse brought about by a malevolent glare, usually inspired by envy. [ 1] The belief in the evil eye among humans has existed since prehistory, [ 1] [failed verification] and amulets to protect against it have been found dating to around ...
Human skin color. Extended Coloured ( Afrikaans: Kleurlinge or Bruinmense) family from South Africa showing some spectrum of human skin coloration. Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among individuals is caused by variation in pigmentation, which is the result of genetics (inherited ...
Heterochromia iridum is the name of this rare phenomenon. It occurs when the iris—the colored part of the eye surrounding the pupil—exhibits two different colors. Most cases of heterochromia ...
The human eye, showing the iris and pupil. In 1802, philosopher William Paley called it a miracle of " design ." In 1859, Charles Darwin himself wrote in his Origin of Species, that the evolution of the eye by natural selection seemed at first glance "absurd in the highest possible degree". [3] However, he went on that despite the difficulty in ...
Ancient records of onion use spans western and eastern Asia, so the geographic origin of the onion is uncertain. [17] [18] Yet, domestication likely took place in West or Central Asia. [3]: 20–21 [19] Onions have been variously described as having originated in Iran, western Pakistan and Central Asia. [17] [19]: 1 [18] [20]
lobia. The black-eyed pea or black-eyed bean [2] is a legume grown around the world for its medium-sized, edible bean. It is a subspecies of the cowpea, an Old World plant domesticated in Africa, and is sometimes simply called a cowpea. The common commercial variety is called the California Blackeye; it is pale-colored with a prominent black spot.