50 scientific trivia
1, the rabbit uses the leg to beat the ground to convey information, with the hind legs to slap the ground most of the male rabbits, this is a way for it to express emotions to the female rabbit.
2, the world's largest monkey is the baboon, the smallest monkey is the marmoset.
3, "four different like" the real name is called elk, is a rare animal in our country.
4. Why does the sorbet get angry?
The reason why the sorbet is inflated is because there is a lot of water vapor in the outside air that cannot be seen by the eyes, and when it encounters a very cold sorbet, it will liquefy into droplets of fog around the sorbet, which looks like the sorbet is "inflating".
5. Why do sunflowers always face the sun?
The stems of sunflowers contain a wonderful phytotenin. This auxin is very light-resistant. As soon as the light is illuminated, it will go to the backlit side, and it also stimulates the cells on the backlight side to multiply rapidly, so the backlit side grows faster than the light side, so that the sunflower produces a phototropic bend.
6. Why do cicadas molt?
The shell (exoskeleton) of the cicada is hard and cannot be expanded with the growth of the cicada, when the cicada grows to a certain stage, the exoskeleton of the cicada restricts the growth of the cicada, and the cicada takes off the original exoskeleton, which is the cicada metamorphosis.
7. How do bees make honey?
The bee first spits the sweet juice of the harvested flowers into an empty hive, and at night, it sucks the sweet juice into its own honey stomach for concoction, and then spits it out, and then swallows it again, so that it takes turns to swallow and spit, to carry out 100 to 240 times, and finally brew sweet honey.
8. Why do the stars flicker and twinkle?
We see stars twinkling, not because of a change in the luminosity of the stars themselves, but because of the occlusion of the atmosphere. The atmosphere is spaced between us and the stars, and as the starlight passes through the atmosphere, it is affected by the density and thickness of the atmosphere. The atmosphere is not absolutely transparent, and its transparency varies depending on the density. So when we look at the stars through it on the ground, we see that the stars seem to be flashing.
9. Why do people yawn?
When we feel tired, a lot of carbon dioxide has been produced in the body. When there is too much carbon dioxide, oxygen must be added to balance what the body needs. Because these residual carbon dioxide will affect the functional activity of our body, then the body will issue a protective response, so it will yawn. Yawning is a deep breathing action that allows us to inhale more oxygen and discharge carbon digasified than usual, and also eliminate fatigue.
10. Why can a snake walk without feet?
Snakes have a lot of scales on their bodies, which is the outermost layer of armor on their bodies. Scales are not only used to protect the body, but also to be their "feet". When the snake crawls forward, its body takes on an S-shape. Each scale on the outside of the S shape will be cocked up, helping the snake to grasp the uneven road as it advances. These scales work with the snake's muscles and can push the body forward, so the snake can walk without feet!
11. Why does people's hair turn white when they are old?
There is a substance called "melanin" in our hair, and the more melanin there is, the darker the hair color. If there is less melanin, the hair will turn yellow or white. When humans reach old age, the various functions of the body will gradually decline, and the formation of pigment will become less and less, so the hair will gradually turn white!
12. Why do fireflies emit light?
Fireflies emit light because they have an illuminator at the end of their abdomen, which is filled with many phosphorus-containing luminous substances and luminous enzymes, allowing fireflies to emit a flash of light. The purpose of fireflies to emit light, in addition to illumination, there are also uses such as courtship, vigilance, and trapping. This is also a communication tool for them, and different kinds of fireflies will emit light in different ways, with different frequencies and colors, which will convey different messages.
13. Why do I grunt when I am hungry?
When the stomach is hungry, it will grunt, because the food eaten before is quickly digested, and although the stomach is empty, the gastric juice in the stomach will continue to be secreted. At this time, the contraction of the stomach will gradually expand, and the liquid and gas inside will stir up, causing a grunting sound. Next time don't be embarrassed by your stomach grumbling! Because this is a normal physiological action.
14. Why can't ostriches fly?
A species of giant camel bird, but they don't fly into the sky! It's not because their wings don't work, it's that their feathers are too soft and their wings are too small to fly at all. In addition, the ostrich is not muscular and has a flat sternum, which is not helpful for flight. Ostriches live in Africa, because of their long-term residence in desert areas, the body in order to adapt to the environment, gradually evolved into the current appearance.
15. Why is the food in the canned food not easy to spoil?
Lunch meat, tempeh mud carp, eggplant beans... They are all delicious canned foods, and they can be stored for a long time without being easy to spoil. This is because the can is sealed, and bacteria cannot enter. When people make canned food, they take all the air out of the can and then seal it. In the absence of air, even if the food inside is stained with a little bacteria, they cannot survive or reproduce!
16. Why do babies cry when they are just born?
Babies cry when they are born, not because they are unhappy, but because they are taking their first breath of air! When babies leave their mother's body and are born, the first breath of air they inhale rushes into the throat, which violently impacts the vocal cords, causing the vocal cords to vibrate and then make a sound similar to a cry.
17. Why does the lizard keep bouncing after its tail is broken?
In order to protect themselves, many lizards also benefit from the protection of the eyes and ears, and some lizards when attacked, the tail will be severed due to violent muscle contraction. Based on the fact that some nerves are still alive in the broken tail, it will constantly bounce, thus distracting the enemy in order to escape. Don't think that their lives will end like this, in fact, it will only take many months, and the tail will grow again and continue to live.
18. Why is the tail of a squirrel particularly large?
Don't look at the tail of the easy rat! While the squirrel is jumping around in the tree, its tail is playing a great role. It allows squirrels to be balanced when jumping in trees and avoid falling down and getting injured. In addition, this large tail can play a protective role in winter, tightly surrounding the body of the squirrel, which is both convenient and practical.
19. Why can't a person's thumb have one or three sections?
The average person has five fingers, and the length of the fingers varies. But has anyone noticed that in addition to the thumb, there are three other fingers, and only the thumb has two? It turned out that its number of knots matched the other four fingers. If there are three sections, the thumb will appear weak to lift the heavier object; if there is only one section, it will not be able to grasp the other four fingers freely!
20. Why don't I feel itchy when I scratch myself?
When others scratch themselves, we feel itchy and laugh constantly; but when we scratch ourselves, we not only don't laugh, but we don't feel itchy. Based on our mental preparation, the brain sends a message that "there will be no danger", and the nerves relax, so we don't laugh and feel itchy!
21, why is the sea mostly blue and green?
Looking at the sea, many times you will also find that the sea is blue and green. However, when you fish the seawater, you can only see that it is as transparent and colorless as the water of the past. It turns out that the sea water itself is not very different from the water we come into contact with on a daily basis, 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 by the seawater and thus reflected; when the seawater is deeper, the green light is also absorbed, and the seawater looks blue.
22. Why do I get goosebumps?
Our skin has hairs on the surface of the skin, and there is a vertical hair muscle under each pore, and when we are stimulated by nerves (e.g., anger, fear, cold, etc.), the temperature of the body will drop, and the vertical hair muscle will contract and make the hair stand up, forming goosebumps. In addition to its role as a warmer, this physiological system can also make the animal look larger than it actually is, thus deterring the enemy.
23, the seahorse was born from the belly of the father?
Almost all animals are also female breeding descendants, but the hippocampus is different, it is born from males. On the belly of the male seahorse there is an incubated egg sac like a kangaroo "nursery bag", and the female seahorse will discharge the eggs into the incubation oocyst of the male seahorse. After that, the male seahorse took on the responsibility of conception, and after about three weeks, the baby seahorse was ejected from Dad's body.
24. Why do leaves change color?
The cause of the discoloration of leaves is related to the chemical they contain, chlorophyll. When autumn comes, the days are shorter than in summer, and the temperatures are lower, so the leaves stop making chlorophyll, and the remaining nutrients are transported to the trunk and roots of the tree for storage. The green chlorophyll is missing from the leaves, and at the same time, other chemical pigments are revealed, so we see more leaves of yellow and brown colors.
25. Why are there fallen leaves?
Autumn comes when more water evaporates from the leaves than in summer, but the roots absorb less water than in summer. In order to reduce the water loss of the tree, the cells in the stem begin to form a separation layer, and after the nutrients have completely left the leaves, the separation layer will isolate the leaves from the trunk, and the leaves will fall down.
26. Why do whales spray water?
Whales are a type of mammal, but they have no nose shell and nostrils on the top of their heads. It lives in the water with its lungs, can store a lot of air at once, and does not have to go to the surface of the water to ventilate frequently. But when it breathes into the water, it breathes with its nose, and the huge sound waves emitted by the seawater spewing out of the body when it breathes are caused by pressure.
27. How big is the Milky Way? Many perseverances come together to form a huge galaxy in which the galaxy in which the solar system is located is called the Milky Way. The Milky Way is like a large discus, about 80,000 light-years wide, about 12,000 light-years thick at the center, and has a total of more than 1,000 stars.
28. Why can't I see the stars during the day?
Because part of the sunlight is scattered by gas and dust in the atmosphere during the day, the sky is very bright, and the light radiated by the sun is very strong, so that we can't see the stars.
29. What are the celestial bodies in the solar system? There are nine planets in the solar system. They are, in order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. In addition, there are many asteroids, comets and meteors in the solar system, and there are 2958 asteroids that have been officially numbered. The most famous comet is Halley's Comet.
30. How high is the blue sky?
The "blue sky" is actually the earth's atmosphere. The atmosphere surrounds the Earth's air, divided into 5 layers according to the density of the air, a total of 2000-3000 km thick. But most of the air is concentrated from the ground to below 15 kilometers, and the higher you go, the thinner the air becomes. How thick the atmosphere is, how high the blue sky should be.
31. What is thunder?
A: This is a natural phenomenon that occurs together when yin and yang meet. When it rains, some of the clouds in the sky are with yang electricity, some are with yin electricity, and when the two clouds meet together, they will discharge, emit very bright and bright lightning, and at the same time release a lot of heat, so that the surrounding air is quickly heated, expanded, and makes a big sound, which is thunder.
32. Why can an airplane fly into the sky?
A: The plane has two wings, like the wings of a bird, and it also has thrusters. Wings generate lift to lift the aircraft in the air; thrusters generate the ability to push the aircraft forward. As a result, airplanes can fly like birds.
33, hanging on the wall of the quartz clock, when the battery's electrical energy is exhausted and stops moving, its second hand often stops at the "9" position on the dial. This is due to the fact that the second hand is most hindered by the moment of gravity at the "9" position.
34, the electric furnace "combustion" is the conversion of electrical energy into internal energy, no need for oxygen, oxygen can only make the electric furnace wire oxidize and shorten its service life.
35, when the pot contains cold water, the water droplets attached to the outer surface of the pot on the flame for a long time can be burned dry, and until the boiling is dry, it is not boiling, this is due to the water droplets, pot and water in the pot to maintain heat conduction, the temperature is roughly the same, as long as the water in the pot is not boiling, the water droplets will not boil, the water droplets on the flame by evaporation and gradually burned dry
36. There are several small holes on the side of the nozzle of the natural gas furnace that communicate with the outside world, but the natural gas will not be sprayed from the side hole, only from the nozzle. This is due to the large air flow velocity of natural gas at the nozzle, according to the principle of fluid mechanics, the flow rate is large, the pressure is small, and the pressure on the surface of the air flow is less than the atmospheric pressure outside the side face, so the natural gas will not be sprayed out with small holes on the side of the nozzle.
37, the mirror of the deviation, the farther away from the mirror, the more out of the sample. Because the image in the mirror is formed by the reflection of the silver-plated surface behind the mirror, the uneven silver-plated surface or the uneven thickness of the glass will produce aberration. The farther away from the mirror, the greater the deviation from the normal position reached by the light magnification principle, the greater the deviation from the normal position of the reflected light on the silver-plated surface, the more out of shape the mirror.
38, praying mantis is known as the "insect catcher"
39 In Uganda, Africa, there is a rat that can eat cats. This rat is similar to ordinary house mice, but has an extra layer of hard shell on its mouth and grows very hard. This rat can emit a strong smell, and the cat is paralyzed and trembling when it smells it, and cannot move. At this time, the mouse jumped over, bit the cat's throat with its sharp teeth, sucked the blood out, and then dragged the cat to a hidden place and ate it slowly.
40, a kind of literary bird in the Amazon River Basin, when the companion unfortunately dies, other kinds will take colorful petals and green leaves and sprinkle them on the corpse of the companion, "burying" them, and one by one, they will bow their heads to show their mourning for the deceased.
41. Why is the sky red in the morning and evening? In the morning and evening, around sunrise and sunset, colorful rainbows often appear. Both the morning and evening glows are formed due to the scattering of light by air. Scattering occurs when sunlight enters the atmosphere and encounters atmospheric molecules and particles suspended in the atmosphere. These atmospheric molecules and particles themselves do not emit light, but because they scatter sunlight, each atmospheric molecule forms a scattered light
source. According to Rayleigh's law of scattering, the light of the colors of purple, blue, and cyan with shorter wavelengths in the solar spectrum is the most easily scattered, while the light transmission ability of red, orange, yellow and other colors with longer wavelengths is very strong. As a result, we see that the sky is always blue, and the light above the horizon is only yellow, orange, and red with longer wavelengths. After these rays are scattered by impurities such as air molecules and water vapor, the sky there is tinged with brilliant colors.
42. Why is the bottle filled with water not easy to break?
There are two identical glass bottles, one empty and one filled with water, while falling to the ground from the same height, which bottle is easy to break? It is generally said that heavy bottles are easy to break. However, when the bottle is filled with water, the water in the bottle has another role, which can reduce the deformation of the bottle, but make the bottle not easy to break. Glass bottles are broken, mostly due to deformation. The empty bottle landed on the ground, and the ground put a pressure on the bottle, and the bottle deformed from the outside to the inside, and finally broke. The bottle is filled with water, and since the water is incompressible, it reduces deformation and makes the bottle less prone to rupture. The bottle is filled with water, and then the cap is tightened, and it is even more difficult to break.
43, Hala-flavored food is toxic In daily life, people often encounter the situation of food spoilage. The process of food spoilage is the decomposition and change process of protein, carbohydrate and fat in food, and its degree varies according to the type of food, the type and quantity of microorganisms and the different environmental conditions. Usually the deterioration of fat is mainly due to rancidity, which is a kind of food mutagenic pollution. Enzymes, ultraviolet rays and oxygen produced by microorganisms can decompose the neutral fats in food into glycerol and fatty acids, which are further decomposed to produce peroxides and oxides, followed by rancidated products such as ketones and aldehydes with special irritating odors, the so-called harrah taste. Eating food that has been stored for too long due to slow sales will lead to poisoning, and the clinical manifestations are mainly gastrointestinal pathologies, and some patients will have symptoms such as dizziness, headache, bloating, diarrhea, abdominal pain, nausea and vomiting.
44, laughter can make people healthy, this is because laughter can make people's lungs expand the amount of breathing, increase blood circulation: accelerate the promotion of endocrine activities, happy mood to improve appetite is an increase in digestive juices.
45, the reason why maple leaves turn red: one is the role of anthocyanins, and the other is that chlorophyll is constantly decomposed due to the cold weather and is replaced by anthocyanins.
46. Under the inspiration of dolphins, scientists have made an underwater acoustic detector material - echo detector
47, the naming and pattern of biological specimens: scientists to each organism they have studied but not recorded a Latin scientific name, including genus name and species name two Latin characters, called the two names of the method, in 1758 by the Swedish scientist Linnaeus pioneered. The specimen on which the designation is based is called the type specimen, in which one is specified as a positive mold and the rest is a secondary mold.
48, vitamin C is reductive, can not be eaten with seafood food.
49, new furniture usually has formaldehyde, you can put concentrated ammonia to absorb formaldehyde
50, sausages, cured meat, pickles contain sodium nitrite, in the human body under certain conditions to generate nitrite amines, carcinogens