What kind of people can perceive ultraviolet radiation and in what form? Detailed answer

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What kind of people can perceive ultraviolet radiation and in what form? Detailed answer

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What kind of people can perceive ultraviolet radiation and in what form?

If a person is missing the lens of the eye as a result of surgery, trauma, or a congenital anomaly, they are able to perceive ultraviolet light as a whitish-blue or whitish-purple color. However, this is not the same as true tetrachromatism, which many birds, fish, and insects possess. With such vision, in addition to the three ordinary cones, there is a fourth in the eye, which perceives just the ultraviolet spectrum, due to which the number of distinguishable shades of colors is much higher.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What French writer could receive letters that did not contain street and house numbers?

In his last years, the writer Victor Hugo lived in a mansion on a Parisian street, which during his lifetime was called Victor Hugo Avenue. As a return address on the letters, the writer simply indicated: "Monsieur Victor Hugo on his avenue in Paris."

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Parents smoke - children get sick 04.08.2011

Pediatricians from Heidelberg (Germany), after examining 4236 kindergarteners and the conditions in their families, came to the conclusion that children of smoking parents at the age of four or five years are often prone to hypertension.

In the surveyed families, 29% of fathers smoked, 21% of mothers smoked, and both parents smoked in 12% of families. In 20% of children exposed to tobacco smoke at home, the upper value of blood pressure turned out to be at the limit of the norm, and there is a risk that hypertension will develop in the future. In addition, children in smoking families are more likely to get colds, asthma and inflammation of the middle ear.

By the way, back in 2004, Swedish researchers found that even in cases where parents smoke only on the balcony or on the landing, the blood of children contains twice as much nicotine residues than children from non-smoking families. Obviously, nicotine gets to them through the breath of parents and their clothes.

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