What is the puzzle of the world?

Chewing gum takes seven years to digest?

Some people say that chewing gum takes seven years to digest. A scientist is conducting an important experiment in the laboratory, trying to uncover the true face of this nonsense.

Scientists certainly don't need to digest it themselves. She prepared a simulated stomach in the laboratory. What substances in the human body are used for digestion? First of all, enzymes such as gastrin, in addition to hydrogen chloride to help. These two chemicals are enough to turn the cake into a paste in three hours. And the gum doesn't seem to move for 24 hours.

This discovery is not surprising, because the main ingredients of modern chewing gum are generally indigestible, such as polyethylene and polyvinyl acetate. No matter how strong human digestive organs are, they can't digest plastic. What will happen to stubborn chewing gum? Within 24 hours after being swallowed, chewing gum will begin a journey in your stomach.

2. How to pour the wine out of the bottle as quickly as possible?

People who love drinking are interested in a good sense of smell and complicated taste, but they are more interested in how quickly they can pour wine into a glass. Besides arguing about their favorite wine, they also have different opinions about the fastest way to pour it.

The first presenter put down the bottle. The second presenter tilted the bottle at an angle. The third presenter not only tilted the bottle at a certain angle, but also rotated the bottle.

The speed at which the liquid is poured out of the bottle depends on the speed at which the liquid is replaced by air. Rotating a bottle will produce a vortex, just like a tube. Air can enter the bottle through vortex, so that the liquid can flow out quickly. So, the next time you are in a hurry to drink, turn the bottle.

Will it be sucked away at an altitude of 3.9000m?

The plane was at an altitude of 9000 meters, and suddenly a madman tried to open the hatch. In a second, you will be sucked out of the cloud. Will this really happen?

The answer is no, after the plane took off, the pressure outside the cabin door decreased. At an altitude of 9000 meters, the hatch is tightly pressed by a relatively large air pressure, which is equivalent to 5000 kilograms. So, no madman can open the hatch.

4. Will the fish be released?

At the Downsner Marine Laboratory near Auburn on the west coast of Scotland, scientists Ben Wilson and Dr. Bob Buddy stayed up all night and conducted a strange test on a can of herring. They are bent on determining whether the fish will be released.

To prove that fish can be released, Dr. Wilson must have real evidence. Wilson and Buddy set up an infrared underwater camera and stared at the herring until late at night. They stayed in the dark for several hours, watching the air flow tester, and finally they captured a video of the fish, and bubbles emerged from its anal hole and recorded the sound.

Why release herring? Wilson and Buddy turned their attention to swim bladder, which is an organ used by herring to regulate buoyancy. During the day, herring gather in deep water. At night, they will swim to the surface, breathe in air and fill the air with the swim bladder again. Perhaps the herring used the swim bladder as an underwater bag.

Dr Wilson said: "The number of released fish is directly proportional to the number of fish in the aquarium. The more fish there are, the more times each fish is released on average. They only play when they gather, so I think playing has some communication function. At night, the herring will spread out. There is still an unsolved problem: how to connect them so that they can be reunited in the morning. Maybe one of their contact information is to put.

5. Why do some people get carsick and others don't?

Dr Ralph Anken is a zoologist at the University of Hohenheim in Stuttgart. After cutting a fish, he wants to find out why some people get carsick and others don't. Anken said: "The doorway is above these bones ... more precisely, these otoliths."

According to Dr. Anken's theory, these small stones in fish and human inner ear may be the chief culprit of carsickness.

Dr. Anken believes that there are two stones on the fluff of the fish's inner ear, which can help them keep balance. Humans have a similar system, except that we have hundreds of such small stones stuck to two different hairs in the inner ear.

In order to make the fish carsick, Anken made them spin in a centrifuge. After stopping spinning, some fish quickly stabilized ... others kept spinning ... these fish were equivalent to carsickness.

Dr. Anken found that fish with different otoliths are more likely to get carsick than fish with similar otoliths. He thinks the same is true of human beings.

Anken said: "Because these stones may have different sizes and weights in the left and right inner ears. So the information sent to the brain is different. In this special environment, such as a car or a boat, this may cause problems, leading to motion sickness or seasickness. "

When the information conveyed by our ears is confused, we will make up for it with our eyes. But when the visual information is also confused, the balance will be affected. The fast jumping sight will affect the balance when riding.

6. Will you drown if you fall into the water in rain boots?

People often say that if you fall into the water with rain boots on, they will drag you to the bottom. Test this statement with science. Look at the weight of rain boots filled with water first. Six kilograms. Now let's do a scientific experiment to see if the demonstrator swimming in rain boots will drown.

The result was disappointing. He struggled, but didn't sink to the bottom. Why? Part of the reason is that his feet are in his shoes and his rain boots don't get much water; Also, don't forget to measure the weight of rain boots again. Only 500 grams! Why? Because the weight of water in water is similar to that of the surrounding water.

7. Is the cold related to clothes?

If you believe what most mothers say, colds are related to clothes. Mom always says "dress warmly" and "don't go out with wet hair". But doctors always insist that everything about colds is related to viruses and has nothing to do with colds. Who is right, mother or doctor?

Professor Ron eccles is in charge of a recent study at Cardiff University. He designed an experiment. The number of subjects was 180, and half of them soaked their feet in cold water. The other half's feet are well wrapped and warm.

In the cold water immersion group, 13 of 90 people caught a cold within four or five days. In the control group, only 5 out of 90 people caught a cold. For these two types of people, this difference is already great.

However, what is going on? Surprisingly, the answer has something to do with the nose.

The main function of the nose is to raise the air temperature before the air we breathe enters the lungs. The body does this through a complex vascular system. Blood vessels guide blood to the inner layer of nasal cavity, warming the inhaled cold air like warm air. However, in cold weather, the body turns to a state of survival, leading the blood in the nasal cavity to the core of the body to avoid heat loss. This is good news for the cold virus. The virus lives in the nasal cavity and constantly fights against white blood cells. White blood cells are the infantry of human immune system, and they go to the battlefield with blood flow. So when the cold weather stops the blood supply, our defense ability is weakened.

Professor Ron eccles said: "Cold constricts blood vessels and reduces the supply of white blood cells. The virus has a chance to replicate and start to grow in the nasal cavity, leading to those annoying symptoms, such as stuffy nose, runny nose and sneezing. These are common symptoms when catching a cold. "