Why are beer bottles mostly green?

   While beer has a very long history, beer in glass bottles has not been around for very long, starting around the mid-19th century. Initially, people even thought that glass was green. This is because the original glass manufacturing process is not very exquisite, and it is difficult to remove impurity ions such as ferrous ions in the raw materials, so the produced glass is green.
   Later, the glass manufacturing process was advanced, and these impurities could be removed, but the cost was too high, and people found that green wine bottles could delay the taste of beer, so at the end of the 19th century, people specially produced green glass bottles to hold beer, and the tradition of green beer bottles also So it was kept. And people also add ferrous oxide and chromium oxide to the glass as dyes to make it look greener.
   By the 1930s, people accidentally discovered that beer in brown bottles was better at avoiding the effects of light on beer, so brown bottles were used later.

   In the early flowering stage of sunflower, that is, its flower buds have just bloomed and the pollen has not yet matured, the flower disk does follow the sun every day, from east to west; once the pollen matures, the sunflower no longer follows the sun, but the flower disk always faces east. southerly.
   Sunflower can quickly dispatch auxin and flavonoids in the body, and easily complete the physical movement of “big head” rotation – auxin and flavonoids are afraid of sunlight, and will slowly shift to the side of the backlight when exposed to light, At the same time, the cells on the backlit surface are stimulated to multiply rapidly. Therefore, the backlit side grows faster than the light side—the sunflower uses the complex chemical “messenger” differential growth to drive the rotation of the sunflower flower disk.
   Sunflowers seem to understand that if they face the sun all the time, the flowers will act like an brooder, gathering the heat of the sun and promoting better and faster sunflower seeds. Sunflower pollen is afraid of high temperature. If the temperature exceeds 30 degrees Celsius, it is beyond the understanding of pollen and is easily burned. At this time, the secretion of auxin decreases, and the cork layer is formed. Therefore, by this period, the sunflower phalanx will put away its enthusiasm for the sun, and the ground will face southeast. As the sunflower disk increases, the sunflower bends eastward in the morning, stands upright at noon, bends westward in the afternoon, and stands upright at night, and this cycle of turning will gradually stop. The orientation of the faceplate hardly changes, except for the increasingly obvious drooping head.

   There are two ideals. One is the social ideal, aimed at salvation and social transformation. The other is the ideal of life, aimed at self-help and personal perfection. If the former has a question of whether it is in line with social reality, then, for the latter, this question does not exist at all. The ideal of life is only about the soul of the individual. Under any social conditions, a person can always pursue wisdom and virtue. If you don’t pursue it, it’s just because you don’t want to, and you can’t justify yourself with unrealistic reasons.
   Ideal is the sustenance of soul life. Therefore, in terms of life, idealism will appear out of date if the world emphasizes practicality and ignores ideals; in terms of life, as long as a person values ​​the life of the soul, idealism will never be out of date for him.
   Idealism will never go away, it is always in the heart of everyone who cherishes spiritual values, and this is the only way it exists in any era.
   Ideals, beliefs, truth, love, goodness, these spiritual values ​​will never exist in a visible form, and they can only be realized in the inner world of people. It is in this invisible realm that some people live in light and some people live in darkness.
   Of course, ideals need to be revised according to the actual situation, but the revision does not involve basic spiritual values, and the ideal cannot be revised so that it is no longer an ideal, for example, to give up the principle of being a human being for worldly interests.
   Ideals refer to those spiritual values ​​that are truly worth pursuing. They can never be fully realized, but provide a goal and a direction for life or society. For example, the ideal of truth, goodness and beauty provides a direction for life, and the ideal of fairness and justice provides society with a direction. provides a direction. We cannot require such ideals to be fully realized before acknowledging that they have value, which is that they are above reality, and therefore guide reality, provide purpose and direction. Young people are prone to have unrealistic fantasies about reality. Once they come into contact with reality, they will hit a wall and feel disillusioned with their ideals. I think this is not called idealism, this is called naive, because naive and idealized reality. Therefore, first, don’t idealize reality. Reality may have a cruel side. You must face it squarely, face it, and adjust your understanding of it with the growth of experience. But secondly, in reality, we must still adhere to the direction of spiritual pursuit, and not conspire with the bad reality.
   We can only live in the present forever, to be great, to be great now, to be detached, to be detached now, to be happy, to be happy now. In short, if you have an ideal of life in your mind, then you should realize it now. If you just imagine that you will be great, detached, or happy one day in the future, and now you are always bored, bored, and miserable, I am sure you will never have a great, detached, happy day. As an attitude to life, ideals are in the present tense, not in the future.