The owl has many uses. The ancient wise man, who observed the nature of the owl, and observed what it did, and showed that it could be used for all things.
The owl's eyes are keen, and it sees things in the dark like day. Its eyes can gather dim light to distinguish the slightest. This ability can inspire the thinking of craftsmen to make tools. If it can imitate the subtlety of its eyes, it can be made into a night vision device, and those who act in the night, such as soldiers on the night watch and merchants on the night, can easily. Although traveling in the dark, it can also see the four directions, avoid obstacles, and prevent problems before they happen.
Furthermore, the owl flies lightly and silently. Its wing feathers are unique in structure, and the edges of the flight feathers are soft and serrated, which can eliminate the noise of airflow when flying. If a skilled craftsman learns the shape of his wing feathers, it can be used in the system of boats, boats, and vehicles, so that the journey is quiet and silent. In the army, a surprise attack at night, the silent tool can be unexpected to the enemy; on the road of business travel, a quiet journey can ensure the stability of goods and goods, free from disturbance.
The owl's claws are sharp and powerful, and it can capture prey in an instant. The craftsman can improve the grasp of the tool. For example, making agricultural tools makes the grip firm and plows the land deeply; making hooks and ropes makes the capture accurate, and the lifting of heavy objects is stable without falling.
And the owl is in the ecology, catching rats and insects to protect the crops. Farmers observe it, and they can understand the reason of natural checks and balances. Do not use medicinal bait indiscriminately, and make friends with owls and the like, so that the rats and insects in the field can be made, and the crops are abundant.
From this perspective, owls can be used for reference in equipment manufacturing, military business travel, and agricultural ecology. The wise look at all things, take their strengths and avoid their weaknesses, seek well-being for people's livelihood, and increase their skills. This is also the use of owls.

The mercury pill is an ancient elixir, and its physical characteristics are quite unique.
The color of mercury pill is often vermilion, bright and eye-catching, just like the brilliance of the red sun, which is eye-catching. Its texture is delicate and uniform, and it is smooth to the touch, just like a high-quality brocade.
In terms of its density, mercury pill is heavier than ordinary things. When held in the hand, it feels quite sinking, which is caused by the characteristics of its internal composition. And the melting point of mercury pill is relatively not very high. When it is moderately hot, it is easy to melt into a flowing liquid, just like a red stream, which is very agile.
Furthermore, the chemical properties of mercury pills are still stable at room temperature, but in case of special chemical reagents or specific environmental conditions, wonderful changes will occur. In case of strong oxidizing agents, it may cause violent reactions and release unique chemical signals.
Although mercury pills have such physical properties, they contain toxic ingredients such as mercury, and should be used with extreme caution. In ancient times, alchemists used mercury pills as medicine, but because they did not know the toxicity of mercury pills, they often caused serious illness and even death. Therefore, when exploring the physical properties of mercury pills, they should also keep in mind its potential harm, and must not be ignored because of the wonder of its appearance.

Mercury is the most yin in nature, and its quality is a liquid, which is liquid at room temperature and shines like silver, so it is also called mercury. Its shape is soft and uncertain, and it is scattered when it encounters objects, just like a smart spiritual liquid.
Mercury's chemical properties are extremely unique. Its degree of activity is different from that of other metals. Although it is not like sodium, potassium and other metals, it reacts violently when exposed to water, nor is it completely inert. Mercury is stable in the air at room temperature and is not easy to combine with oxygen quickly, so it can maintain its liquid shape and shiny color for a long time.
However, if heated, mercury can gradually combine with oxygen to form mercury oxide. This change can be seen in the mercury oxide powder that is placed in a closed container and heated to a certain temperature, and the mercury surface gradually turns red. This reaction is actually a process of combining mercury with oxygen in the air, and it also shows that mercury can combine with oxidation under certain conditions.
In addition, mercury can form alloys with many metals. This alloy is called amalgam. The formation of amalgam is mostly due to the fact that mercury can penetrate into the lattice structure of other metals and form a special mixture with it. Metals such as gold and silver can form amalgam with mercury. This property was also used in ancient metallurgy, such as the extraction of precious metals such as gold and silver by amalgam method. The chemical properties of mercury are both relatively stable and active under specific conditions, and can undergo chemical changes with oxygen, metals, etc. This is the unique chemical properties of mercury.

The method of making calamine has been known in ancient times. Calamine is warm in nature and sweet in taste. It has the effect of detoxifying the eyesight and retreating the shade, reducing moisture, relieving itching and astringent sores.
There are various ways to make it. First, the calcination and quenching method. Take calamine, wash it, smash it into small pieces, put it in a refractory container, calcine it with fire until it is red, take it out, pour it into water immediately, soak it, stir it, pour the upper suspension, and continue to calcinate and quench the residue 3 to 4 times until it cannot be suspended. Combine the suspension, let it stand, and after clarification, pour the upper layer of water, dry it, and crush it. This calcination and quenching method can make the calamine crispy in texture, easy to crush, and enhance the efficacy of medicine. " "Compendium of Materia Medica" says: "Calamine, use a gold and silver pot or casserole pot with the three yellow decoction juice, quench it seven times, and use the powder water to fly over." Among them, the three yellow ones, Scutellaria baicalensis, Coptis chinensis, and Phellodendron are also quenched with the three yellow decoction, which can be used by virtue of its bitter and cold properties to cooperate with calamine to clear heat, laze fire and detoxify.
Second, the water flying method. Crush calamine into coarse powder, add an appropriate amount of water to grind it together, add a large amount of water, stir, pour out the suspension, sink the coarse grains and then repeat the operation according to law, until the suspension is clarified, merge the suspension, let it stand, separate the precipitation, The water flying method can make the drug very fine and pure, easy to prepare and take, and can remove impurities and reduce toxicity.
There are other ways to co-produce with other drugs. For example, co-production with Coptis chinensis, Phellodendron and other drugs that clear away heat, dryness and dampness and detoxify can increase its ability to clear away heat, dryness and dampness and detoxify; co-production with borax and borax can enhance its ability to clear away heat, reduce swelling and retreat.
All these methods are good methods for making calamine. The user should make calamine according to the condition, medicinal properties, and reasonable selection method to make it play the best effect.

The method of hiding ice has been known in ancient times. When hiding ice and transporting it, many matters need to be paid attention to.
When hiding ice, the first ice source. Ice should be taken from a clean place, such as deep mountains and clear springs, the main stream of a big river. The water source is clear, and the ice is pure and filthy, so that it can be preserved for a long time and can be used for various purposes.
The location of the ice cellar is also the key. It should be selected in a high dry place. If the terrain is high, it is not easy to be disturbed by water. A dry environment can reduce the melting of ice. Trees should be densely planted around the ice cellar to shade the sun and reduce the intrusion of external heat. The cellar wall should be thick and solid, and it can be strictly built with masonry, and the gaps should be filled with mud and ash to prevent the escape of cold air.
When ice enters the It is advisable to leave a little gap between the ice and the ice, not too close, so that the cold air can flow around it, so as to avoid the adhesion of ice blocks and affect the use. And each layer of ice should be covered with straw, reed mats and other objects, one is to insulate the temperature, and the other is to prevent the wear of the ice surface.
When transporting ice, utensils are extremely important. It must be wrapped in thick and insulated materials, such as wooden boxes with built-in quilts, felt blankets, etc., to delay the melting of ice. During transportation, strive to be smooth and fast, reduce bumps and vibrations, to prevent the ice from breaking and increase the melting area.
Seasonal climate is also essential. Hidden ice is mostly in cold winter, when the ice is hard and thick, easy to collect and store The transportation should avoid the hot sun and heat, and choose the morning, evening or night when the temperature is low to reduce the loss of ice.
All matters of ice storage and ice transportation need to be done with caution. If you are not careful, the ice will be easily melted and lose its effectiveness.