Science and Technology Festival Manuscript 1
Science and technology festival manuscript ii
Science and technology festival manuscript iii
Common sense of drinking milk scientifically
Drinking milk is good for health, but many people still have some conceptual misunderstandings about drinking milk. This article introduces some common sense of drinking milk scientifically.
1, it is not appropriate to drink milk on an empty stomach in the morning. Because the gastrointestinal peristalsis is fast when the human body is on an empty stomach, the nutrients in milk often rush into the large intestine before being absorbed. In addition, the method of swallowing milk is not feasible, because it will reduce the chance of mixing with saliva in the mouth, which is not conducive to digestion and absorption. Eat some biscuit cake before drinking milk, or drink milk while eating snacks.
It is more beneficial to drink milk at night. Scientific research has found that there is a special law of calcium metabolism in human body: at night, especially at midnight, the plasma calcium content will appear a "trough", forcing the body to transport part of calcium in bones to supplement it through regulation mechanism. Although this temporarily maintains the calcium in the blood, the calcium in the bones is reduced. Milk is rich in calcium. Drinking a glass of milk before going to bed can compensate the body's demand for calcium at night.
Milk should not be cooked with sugar. Milk is rich in amino acids. At high temperature, lysine in milk reacts with sugar to produce a new compound-fructosyl amino acid. This substance can't be digested and absorbed by human body, but it affects human health. Milk can be drunk fresh. If it is too cold, it can be heated slightly.
4. If you don't like milk, you can drink yogurt. Most people who hate milk suffer from lactose intolerance. These people can try to drink yogurt. The lactose content in yogurt is greatly reduced, but almost all the nutrients in milk are retained. Among them, lactic acid bacteria can survive and reproduce in human body, which is beneficial to the absorption and utilization of nutrients and improves immunity. Yogurt contains no antibiotics, is easy to digest and absorb, and can be drunk on an empty stomach.
5. Yogurt can't be heated for drinking. Drinking yogurt is mainly about eating its nutrients and living bacteria. For example, when yogurt is heated, the human body can only drink nutrients but lose bioactive lactic acid bacteria, so don't drink it after heating.
Small scientific knowledge
Why do the stars twinkle?
We see the stars shining, not because the luminosity of the stars has changed, but because of the occlusion of the atmosphere. The atmosphere is between us and the stars. When starlight passes through the atmosphere, it will be affected by the density and thickness of the atmosphere. The atmosphere is opaque, and its transparency will change according to its density. So when we look at the stars through it on the ground, we will see that the stars seem to be flashing.
Why do sunflowers always bloom towards the sun?
The stem under the sunflower disk contains a substance called auxin. This substance has the function of accelerating replication, but it is anti-optical, and it will run to the backlight side whenever it encounters light.
So when the sun rises, the stem of the sunflower immediately hides to the side of the backlight, as if the whole plant is bent in the direction of the sun.
Why do fireflies glow?
Fireflies emit light because there is a luminous body at the end of their abdomen, which is filled with a lot of phosphorus-containing luminescent substances and luminescent enzymes, so that fireflies can emit flashing light. The purpose of fireflies is not only lighting, but also courtship, vigilance and trapping. This is also a communication tool for them. Different kinds of fireflies emit light in different ways, frequencies and colors, so they can convey different information.
Why is the squirrel's tail so big?
Don't look at the relaxed mouse tail! When the squirrel jumps around the tree, its tail plays a great role. It can keep balance when the squirrel jumps to the tree to avoid falling and being injured. In addition, this big tail can play a more protective role in winter, tightly surrounding the squirrel's body, which is convenient and practical.
Why is the sea mostly blue and green?
Looking at the sea, it is often found that the sea water is blue-green. However, when you pick up the sea water, you can only see it as transparent and colorless as old water. It turns out that the seawater itself is not much different from the water we touch every day, and it is also transparent. The green we see is actually a phenomenon caused by the ability of seawater to absorb light. Only green light can be absorbed and reflected by seawater; When the seawater is deep, the green light is also absorbed, and the seawater looks blue.
Why do leaves change color?
The reason why leaves change color is related to the chemical substance chlorophyll. When autumn comes, the days are shorter and the temperature is lower than that in summer, so the leaves stop producing chlorophyll, and the remaining nutrients are transported to the trunk and roots for storage. Leaves lack green chlorophyll and other chemical pigments appear at the same time, so we often see yellow and brown leaves.
Why does sorbet get angry?
The reason why sorbet bubbles is because there is a lot of invisible water vapor in the outside air. When it comes to cold sorbet, it will liquefy into droplets when it is cold. It seems that the sorbet is bubbling.
Why does cicada shed its skin?
Cicada's shell (exoskeleton) is hard and can't expand with the growth of cicada. When the cicada grows to a certain stage, the cicada's exoskeleton restricts its growth, and the cicada loses its original exoskeleton, which is cicada slough.
How do bees make honey?
First, the bees spit the sweet juice of the flowers they picked into an empty hive. At night, they suck sweet juice into their honey stomachs to make it, and then spit it out and swallow it. It takes 100 ~ 240 times to make sweet honey.
Why do people yawn?
When we feel tired, a lot of carbon dioxide has been produced in our bodies. When there is too much carbon dioxide, oxygen must be supplemented to balance the needs of the body. Because these residual carbon dioxide will affect our body's functional activities, then the body will send out a protective reaction, so we yawn. Yawning is a deep breathing action, which will let us breathe in more oxygen and expel more carbon dioxide than usual, and it can also eliminate fatigue.
Why can snakes walk without feet?
Snakes have many scales, which are the outermost armor on their bodies. Scales are not only used to protect the body, but also to be their "feet". When a snake crawls forward, its body will be S-shaped. Every scale outside the S-shape will tilt upward to help the snake catch the uneven road when it moves forward. These scales cooperate with the muscles of the snake and can push the body forward, so the snake can walk without feet!
Popularize knowledge scientifically
The history of human progress eloquently proves that science and technology are the great historical driving force of human progress and social development. As a bridge between science and technology and human society, popular science is an eternal theme in human history.
From the perspective of sociology of science, the popularization of science is a universal social phenomenon, which inevitably has its own "growing point". The growing point of popular science lies in the intersection of nature and man, science and society. In other words, the interaction between natural science and human society has produced scientific popularization, and science and technology and society, as the "soil" of scientific popularization, have nurtured its growth. Scientific and technological progress and social development have provided new growth points for popular science work, which has a fresh vitality, strong sociality and the times. Figuratively speaking, popular science is a "modern civilized drama" with the times as the background, society as the stage, people as the protagonist, science and technology as the content and facing the general public. There are no traditional reserved programs on this stage.
For a long time, our government has always attached importance to the popularization of science. At present, China has entered a new historical period with economic construction as the center, social transformation and economic transition. Under the socialist market economy system, popular science work is more vigorous. The key lies in putting popular science work in the realistic three-dimensional coordinates of society, economy and culture in time, accurately locating itself, establishing the operation mechanism and operation method consistent with the social system, and choosing popular science topics with the times.
In essence, the popularization of science is a kind of social education. As a social education, it is different from campus education and vocational education, and its basic characteristics are sociality, mass and continuity. The characteristics of popular science show that the work of popular science must use socialized, popular and regular popular science methods, make full use of various circulation channels and information media in modern society, and lose no time in infiltrating into various social activities to form large-scale, dynamic and socialized popular science.
In the current tide of socialist market economy, commodities are not only the result of scientific materialization, but also the carrier of scientific information. As a distribution center of commodity circulation, the market covers many fields of social life, family life and personal life. This is the ideal communication channel and operation mode of popular science work. It is conceivable that if the relevant scientific and technological knowledge is sold together with commodities, it can not only increase the added value of commodities, but also further stimulate the market, form a virtuous circle and promote the proliferation effect of commodities, just like the after-sales service of commercial enterprises. This practice has successful precedents at home and abroad. Nowadays, more and more high-tech products, such as computers and "mobile phones", are entering offices and families. We can do it completely, so that people can be baptized by scientific and technological knowledge while enjoying high-tech achievements. Such a popular science way is a truly socialized, popular and standardized modern social popular science way, and it is also a relatively economical popular science way.
Obviously, popular science is a large-scale and wide-ranging social work, which can never be completed by a certain department or a few full-time personnel. In a sense, everyone in society is the object of popular science, and everyone may become a popular science worker. "Capable people are teachers" is another feature of mass social education. However, science popularization still needs a relatively fixed basic team, that is, scientific and technological workers scattered in various social behaviors. Scientific and technological personnel are the owners of scientific and technological knowledge, and it is their sacred duty to spread scientific and technological knowledge. Some countries regard popular science work as a public welfare social obligation that scientific and technological workers should fulfill.
Modern science and technology is an extremely huge and complex three-dimensional structural system with rich connotations and various social functions. In popular science work, we should not only attach importance to the external utility of scientific and technological knowledge, but also ignore its internal scientific thought, scientific method and scientific spirit. Among the four different levels of knowledge and information (namely, data, information, knowledge and intelligence), intelligence occupies the highest level and is the most active and important quality that constitutes a person's scientific and cultural quality. This is especially important for leading cadres at all levels and managers of scientific and technological work in different positions.
Composition of Science and Technology Festival: Recording Science and Technology Festival
It's the annual science and technology festival again. Today's weather is very good, which is a particularly good day for our teachers and students. Science and technology festival is a great tradition of our campus, and it is also a grand meeting of science and technology activities. During this week, the campus will tailor different activities and competitions for students of all grades. Senior students in senior high schools have high-end activities and various modes. Our activities are simple, interesting and wonderful.
It is said that the spirit of the festival lies in its atmosphere. The Science and Technology Festival adds a layer of science and technology to our entire campus outside Hangzhou. Walking on campus, you can often see the experimental models of seniors and sisters. In the teaching building, students often laugh in various competitions, and every student is influenced by technology.
Our activities include paper airplanes and shooting, paper airplanes floating and bamboo dragonflies, which make the class lively. The students studied several folding methods of paper planes, so in their spare time, paper planes flew all over the sky. In addition, in the corridor, some students tried to fly bamboo dragonflies, or dragged a board to carefully "push" the paper plane forward. I took part in the competition between bamboo dragonfly and suspended plane.
The event was really exciting when the game was going on. The bamboo dragonfly competition is held at noon on Wednesday. Although the sun is shining, the front of the campus information center is still full of people. Wang Zichen and I are in a group. The venue is near the square. In this range, we compare flight time and flight distance. At that time, I felt that flying was not too far, only about two meters. But Chen Shuaihua, a classmate in our class, flew more than six meters. Although the results are still unknown, I believe our class must be very good.
The most exciting game is the paper plane shooting and levitation on Thursday afternoon. The venue is in the campus gymnasium, which is full of students and teachers from Grade One and Grade Two. It is very lively. Compared with the other seven students, I dropped out of school. Everyone is practicing before the game time. As the saying goes, "when you get cold feet, sharpen your knife and don't miss the woodcutter." . At the beginning of the game, we showed our strength. Everyone takes turns to "transport" the plane to the destination in an orderly manner, striving for health while making steady progress. For me, except for being the first to fly out of bounds, I still played normally and felt good about myself later. In the end, our class won the second prize, and the paper plane shooting won the first prize.
The Science and Technology Festival ended successfully, and we gained a lot. In the competition and practice, we not only gained knowledge, but also exercised the team's cooperation ability. Outside Hangzhou, there are many activities at ordinary times. These colorful activities let us learn a lot, enrich our lives, enrich our hearts and teach us how to find a balance between relaxation and study. I love my beautiful campus and the annual science and technology festival!