How ancient people kept warm in winter!

In the Tang Dynasty, people made hand stoves out of copper. The hand stove is oval, with fire or waste heat inside, and a cover outside the stove, which can be put in the sleeve to warm your hands. The foot stove is bigger than the hand stove, so you can put it under your feet to warm your feet. In addition, there are foot-warming bottles, commonly known as soup girls, which are filled with hot water at night and put under the bed; In the Qin Dynasty, craftsmen built the walls of palaces into hollow sandwich walls, commonly known as "fire walls", which could be heated by heating. For example, the fire wall structure of Xianyang Palace site in Qin Dynasty is very famous. The earliest "winter clothes" used by humans to keep warm should be animal skins. People cover their bodies with simple clothes made of animal skins to keep out the cold, which also establishes the irreplaceable position of animal skins in the history of human warmth.

There are many ways for modern people to keep warm from the cold, such as indoor heating, air conditioning, outdoor cotton-padded clothes, warm clothes and down jackets.

Feet are farthest from the heart, blood supply is slow and less, subcutaneous fat layer is thin, and warmth retention is poor. Once caught cold, it will reflexively cause the capillary contraction of respiratory mucosa, which will reduce the disease resistance and lead to upper respiratory tract infection. Therefore, we should strengthen the warmth of our feet in severe cold.