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2021-12-02 07:05:43 WHY are clouds white at night?

A cloud is a collection of water droplets and ice crystals with no color and only partially diffuse light hitting them.

At night, low clouds appear whiter than the sky when the city lights are high.

In contrast, in a dark area, clouds obscure the faint glow of the night sky and appear black. Open / Comment

2021-11-30 11:23:29 WHY do babies have 70 more bones than adults?

Newborns tend to have about 270 bones, most of which are tiny. This makes the skeleton more flexible and helps the baby get through the birth canal and grow quickly. As they get older, many of these bones fuse together. Open / Comment

2021-11-28 21:17:00 Pentagon Chief Confirms US to End Combat Mission in Iraq in 2021

US Defense Secretary Lloyd Austin confirmed that the US military mission in Iraq will be completed before the end of this year during a meeting with his Iraqi counterpart Juma Inad, Pentagon spokesman John Kirby said on Saturday.

Austin further confirmed to the Iraqi defense minister that American forces will remain in Iraq at the invitation of the Iraqi government to support the country's security forces, according to the statement.

The Pentagon chief once again condemned the recent attack on the residence of Iraqi Prime Minister Mustafa Kadhimi and expressed hope that the formation of the new government in Iraq will proceed peacefully.

The meeting took place on the sidelines of the Manama Dialogue international conference on regional security held annually in Bahrain. Open / Comment

2021-11-28 21:02:43 WHY are the ribs of coins notched?

Coins used to be valued according to the amount of metal they contained. Fraudsters used to cut the metal off the edges, pocketing the gold and silver. It was incredibly difficult to catch them.

A solution to this problem was suggested by Isaac Newton, who was an employee of the British Royal Mint. He suggested making fine notches on the edges of the coin, which made the worn edges immediately visible. Open / Comment

2021-11-27 11:39:27 WHY do calculators start at the bottom and the phone starts at the top?

The calculator is the successor of cash registers and mechanical counting machines. That's why the numbers on the calculator from zero to nine are from the bottom to the top.

Until the 1960s, dialing on the telephone was done with a dial. Then tone dialing became possible, and the familiar dial was replaced by buttons.

There were many different attempts: they were arranged in a circle, or in two rows... But as a result, the familiar option was chosen, where the numbers are arranged in three rows in ascending order (from top to bottom). Open / Comment

2021-11-26 09:10:34 WHY are the veins blue if the blood is red?

The bluish or greenish tint of veins is due to the way light passes through layers of skin and subcutaneous fat. When looking at our arm or leg, we see the picture of light reflected from the tissues.

Skin is weak in transmitting light, unlike blood. Yet red waves of light penetrate the tissues better than blue. Blood, on the other hand, more readily absorbs blue and purple light, which explains why we see it as red. When a blood vessel runs close to the surface of the skin, almost all of the blue light is absorbed by the blood and some of the red light is reflected Open / Comment

2021-11-25 14:14:15 WHY does the British Queen lack of a passport?

Even though the Queen does not have a passport, she is free to travel around the world.

Since UK passports are issued in Her Majesty's name, the Queen does not need one. All other members of the royal family have passports.

Also, the Queen is the only person in Great Britain who is allowed to drive a car without a license. Open / Comment

2021-11-24 17:14:23 VP Harris' Niece Meena Wants Parents to Focus on Anti-Racism, Says ‘White Supremacists’ Founded US

Earlier, the New York Times Magazine published a long article on the history of racial inequality. Also known as “project 1619,” the work has received strong criticism from some Republicans, who saw it as an attempt to rewrite history and provoke racial conflict.

Kamala Harris' niece Meena in her article for the Washington Post, published on Tuesday, explained how parents can teach their kids that the United States was founded by “white supremacists” as American schools increasingly resist adopting a broad implementation of Critical Racial Theory (CRT).

The issue of adding CRT to school curriculums has faced strong resistance, both from school personnel and parents, who believe that the theory revises US history to present it in an extremely negative light.

Meanwhile, most elite K-12 private US schools have adopted antiracism training, including CRT, according to a recent study. Open / Comment

2021-11-24 15:13:09 WHY do scorpions have blue blood?

The fact is that the blood of scorpions does not contain hemoglobin, but hemocyanin, its analog. If hemoglobin is an iron-containing substance, then hemocyanin consists of copper.

When in contact with air, this element turns blue and, giving oxygen to tissues, loses its color. Open / Comment

2021-11-23 12:51:29 WHY does stress cause a lump in the throat?

This tells us that the body's autonomic nervous system (ANS) is struggling with the stressful situation. This system is independent of the human will and functions autonomously.

When we're nervous, the ANS tries to oxygenate the body as much as possible. To do this, it forces us to breathe faster and expands a part of our throat called the vocal cleft so that air gets through faster.

The feeling of muscular resistance to closing the throat when we try to swallow is the "lump in the throat". Open / Comment