The south feels very cold in winter, which is not only related to temperature but also to humidity. It feels bitingly cold when it's humid. Some people say that even minus 20 degrees when it's dry feels warmer than 20 degrees when it's humid.

There is no heating in the south, so it is good to turn on the air conditioner to keep warm. It is not so cold outside that the air conditioner needs to be defrosted. The functions of air conditioners include cooling, heating and dehumidification, and heating uses more energy than cooling. The energy efficiency label of my vertical air conditioner states that the electricity consumption during the cooling season is 1289 yuan, and for heating it is 829 yuan, which is nearly half less. The electricity bill for a month of operation is less than 200 yuan, and only 600 yuan for a winter.

When I was in college, a philosophy professor who studied the history of ideas said, are humans really evolving? You have to wonder: Why are we not as frost-resistant as we used to be? It can only be said that once people have money, they become delicate. Human beings' ability to withstand cold is actually evolving.

Hesenborg said in the book "Attack of Homo Sapiens" that Homo erectus in Nanjing has a relatively tall nose. According to some anthropologists, this tall nose is probably a response to the cold environment. An adaptation, because the taller the nose, the larger the space in the nasal cavity. The dry and cold external air can fully contact the nasal mucosa and the blood vessels in the nasal cavity, so that the air is first heated before entering the lungs, so that it will not Injury to the lungs. The correspondence between noses and climate is still reflected in human society today, with Russian noses and Malaysian noses looking noticeably different.

The easiest way to resist the cold is to wear clothes. The first things humans wore were animal skins, which sounded high-end, but were smelly, dirty, and didn't fit well. About 180,000 years ago, the earth's climate began to gradually become colder. This was undoubtedly a huge test for Homo sapiens who had already lost their body hair at that time, and it also became a strong motivation for ancient humans to start wearing clothes.

One evening in the late Paleolithic Age, several Homo sapiens armed with spears marched through the wind and snow. They did not care about being exposed to the extremely cold weather, because they folded time again , peeling off the thick fur that would take other species hundreds of thousands or even millions of years to evolve, and covering it directly on his body. But as they advanced in the wind and snow, they couldn't help but scratch their bodies with their hands, because there were lice in their clothes sucking their blood.

Some misunderstandings about keeping warm:

1. Can drinking hot drinks make you warm?

Coffee, hot tea, hot chocolate, and high-quality drinks can even make you cold after drinking them, because when you drink a hot drink, the receptors on your tongue tell the brain that it is getting hot, and the brain It activates a mechanism to help the body cool down, which is sweating.

2. Do you need a hat when it’s cold because most of the heat is lost from the head?

Some people say that 50% to 70% of the body's heat is lost from the head. But heat loss is related to how much skin is exposed, not which part is exposed. The head accounts for only 10% of body heat loss. Covering your mouth and nose does have the advantage of warming the air you inhale so your lungs don't need to heat it.

3. Don’t wear too bulky clothes

If you wear too bulky clothes, the pressure will be so great that it will affect blood circulation. Don't wear multiple layers of socks because your shoes or boots are too tight and can restrict blood flow. One pair of moisture-wicking wool socks is better than two pairs of cotton socks.