Why are human eyes blue and green even though they don't have these pigments? Detailed answer

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Why are human eyes blue and green even though they don't have these pigments? Detailed answer

Big encyclopedia for children and adults

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Why are human eyes blue and green even though they don't have these pigments?

There are no blue or green pigments in the iris of the human eye. The only coloring pigment in the eye is melanin: at certain concentrations, the color of the eyes becomes from light brown to almost black. However, with a low content of melanin, short waves of the light spectrum are not absorbed by the shell, but are reflected, as a result of which we fix blue, blue, green or gray eyes. This effect is due to Rayleigh scattering of light, which similarly explains the blue or gray color of the sky that we see.

Authors: Jimmy Wales, Larry Sanger

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Where did the transition to the metric system almost lead to a plane crash?

In 1983, Canada was moving to the metric system, and Air Canada ordered new Boeing 767s that were set to liters and kilograms instead of gallons and pounds. Incorrect use of new units of measurement by the crew of one of the aircraft led to the fact that the amount of refueled fuel turned out to be much less than required for the flight. As a result of this error, as well as errors onboard equipment, mid-flight at an altitude of 12 meters, the fuel ran out and the engines stopped. To the credit of the crew, the pilots managed to glide onto the runway of the former military base, and the passengers escaped with only minor injuries.

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Wine polyphenols help maintain healthy teeth and gums, scientists from the Institute for Nutrition Research in Madrid and the Center for Advanced Public Health Research in Valencia (Spain) made such a discovery.

It was previously known that the polyphenols contained in wine are antioxidants that protect the body from the harmful effects of free radicals. Thanks to this, they, in particular, reduce the risk of developing cancer and heart disease.

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