The common cold is the world’s most widespread illness. People believe that colds are caused by cold. They are not. They are caused by viruses passing on from person to person. You catch a cold, and it would be reasonable to expect the Eskimos to suffer from them forever. But they do not. And in isolated arctic regions explorers have reported being free from colds until coming into contact again with infected people from the outside world by way of packages and mail dropped from airplanes.

During the First World War soldiers who spent long periods in the trenches(战壕), cold and wet, showed no increased tendency to catch colds.

In the Second World Was prisoners at the notorious Auschwitz concentration camp, naked and starving, were astonished to find that they seldom had colds.

At the Common Cold Research Unit England, volunteers took part in experiments in which they gave themselves to the discomforts of being cold and wet for long stretches of time. After taking hot baths, they put on bathing suits, allowed themselves to be dipped with cold water, and them stood about dripping wet in wind. Some wore wet socks all day while others exercised in the rain until close to exhaustion. Not one of the volunteers came down with a cold unless a cold virus was actually dropped in his nose.

In the cold we have nothing to do with catching colds. Why are they more frequent in the winter? Despite the most pains-taking research, no one has yet found the answer. One explanation offered by scientists is that people tend to stay together indoors more in cold weather than at other times, and this makes it easier for cold viruses to be passed on.

No one has yet found a cure for the cold. There are drugs and painkillers such as aspirin, but all they do is to relieve the symptoms(症状).

Being in green spaces and connecting with nature is good for your physical and mental health. In Japanese natural healing, forest bathing has been used to decrease stress, anxiety, and even to treat mild depression. Now, scientists have discovered that blue spaces — natural waterways — are also connected to better mental health. A population-based study found that approach to water increased positive feelings of wellbeing.

Being near water gives people a sense of awe, because it gives people a consciousness of something greater than themselves. The sounds and movement of water gets people to focus their attention — like meditation — and this invites calm, You do not have to go to the coast to experience this well-being. Any waterway will do, including lakes, rivers, canals, or ponds. Even a flowing fountain will work.

The study also found that urban waterways were superior to feelings of well-being than just being near the ocean. Canals and rivers contain not only water but also an abundance of trees and plants, which means their capacity to improvement al well-being is likely to be due to the multiple benefits associated with both green and blue spaces.

Canals and rivers also provide homes to a range of wildlife, and we know that there is a notable association between encountering wildlife and mental well-being. Taken collectively, these findings provide an evidence base for what we thought about water and well-being.

These results are very exciting for urban citizens who have access to rivers and canals. The study also found that there were continuous improvements to mental well-being for up to 24 hours after visiting urban waterways. This is all good news. The availability of spaces to be in nature — both green and blue — will help calm their anxiety, stress, and help boost mental health.