Where do they show their tongues to each other? Detailed answer

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Where do they show their tongues to each other? Detailed answer

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Where do they show their tongues to each other?

This custom exists among the Maori, the indigenous population of New Zealand. This is a greeting when meeting.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Why the sky is blue?

There are several possible explanations. The air surrounding the Earth is a mixture of gases: nitrogen, oxygen, argon and others. The atmosphere also contains water vapor and ice crystals. Dust and other small particles are suspended in the air. The ozone layer is in the upper atmosphere. Could this be the reason? Some scientists believed that ozone and water molecules absorb red rays and transmit blue ones. But it turned out that there was simply not enough ozone and water in the atmosphere to color the sky blue.

In 1869, Englishman John Tyndall suggested that dust and other particles scatter light. Blue light is the least scattered and passes through layers of such particles to reach the Earth's surface. In his laboratory, he created a model of smog and illuminated it with a bright white beam. The smog turned deep blue. Tyndall decided that if the air were absolutely pure, then nothing would scatter the light, and we could admire the bright white sky.

Lord Rayleigh also supported this idea, but not for long. In 1899, he published his explanation: it is air, not dust or smoke, that turns the sky blue.

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Trees help with the city heat 09.07.2019

Scientists have found that plants, trees and reflective materials can help fight extreme heat in urban areas.

The phenomenon of rising temperatures in areas with many buildings and sidewalks is known as the urban heat island effect. Previous research suggests that urban heat islands are associated with high levels of pollution and poor health, especially for the elderly, young children and low-income people.

Researchers at the University of Portland have found several ways to reduce the feeling of heat in cities. They used computer simulations to determine the air temperatures that may occur in certain areas of the city depending on various factors.

It turned out that the temperature drops if the area has vegetation, green roofs are installed, or materials that reflect heat are used for roofing and asphalt.

Experts have run computer simulations of Portland, but the program could help other cities fight their heat islands. Using this algorithm, the scientists built maps of the city, showing each land plot, its level of pollution, percentage of vegetation cover, and more.

The study also showed that the measures taken by the authorities to change the face of the city increase the heat indicators on the streets. For example, it was found that asphalting areas that previously had many trees could raise temperatures by 14 degrees on a summer day. Neighboring areas will also experience side effects.

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