It started from the day when it met Ren in winter and entered the "number nine", commonly known as "cross nine". From then on, it was called "Nine" every nine days. After nine "nines", it's just 8 1 day, and then spring blossoms.

Hygienic habits of three or nine days

People often say "it's cold for nine days, but it's cold for three or nine days". Starting from today, we have entered the "March 9th", which is the coldest time in a year. So how do you pay attention to health in three or nine days?

Wear: Wearing a cotton-padded hat in winter is like wearing a cotton-padded jacket.

In cold winter, when people put on thick clothes, heat is mainly lost from exposed parts such as head and hands. People who don't wear hats at rest lose a lot of heat from their heads.

When the ambient temperature is 15℃, the heat lost by the head accounts for 30% of the total heat dissipation of human body, 60% at 4℃ and 75% at-15℃. It can be seen that the warmth of the head is closely related to the thermal balance of the human body.