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The more detergent foam, the stronger the cleaning power?

  Detergents with rich foaming always give people a feeling of stronger cleaning power, but the two are not necessarily related. Whether it is detergent, laundry detergent or shampoo, the detergents that have the decontamination effect are surfactants. Surfactant molecules can “act as a matchmaker” to bridge the two originally incompatible molecules. In other words, the surfactant reduces the tension at the water-oil interface, giving the oil molecules and water a chance to hold hands. The strength of this ability determines the decontamination ability of the surfactant.
  Surfactants can not only reduce the tension of the water-oil interface, but also reduce the tension of the water-air interface, so that after the air molecules break in, the water molecules can “friendly” wrap them up instead of rushing to and their companions. Group and burst the bubbles. In other words, the foaming ability depends on the ability of the detergent to successfully hold water and air together. It is because the decontamination ability and foaming ability are two independent properties of detergents, they will appear. Some detergents have strong decontamination ability, but the amount of foaming is not large; others are the other way around.

Why is the monkey’s cheeks so bulging?

  Speaking of cheek drums, everyone will think of hamsters-the face can be several times bigger after eating. It has a sac-like structure called “cheek pouch” hidden in its cheeks, which is very elastic and can be worn. Not only rodents such as hamsters and chipmunks have such “sacs”, but also platypuses, koalas, and most monkeys. So in the zoo, you will see some monkey cheeks that are particularly bulging, and they are filled with food.
Why do the cheeks pretend to eat so much?

  The reason why hamsters and chipmunks do this is very clear-“If you can’t eat it, just go around.” Animals do not have bags or bags, so they can only rely on themselves to bring excess food to a safe place to enjoy, or store them up, and eat them when they are hungry. After all, it’s not easy to find food, so how can dry rice rats go to waste?
  This is also true for monkeys, especially when they are foraging on the ground, quickly collecting them and then climbing up the trees to enjoy them slowly, which can reduce the risk of being caught by predators. Certain species of Rhesus subfamily also pre-digest food in the cheek pouch to compensate for the insufficiency of gastrointestinal digestion.

Can a pandemic like COVID-19 break out every year?

  The COVID-19 pandemic may be the deadliest global epidemic in more than a century. But a new study published in the Proceedings of the National Academy of Sciences pointed out that similar extreme events may not be uncommon. This study uses a new statistical method to measure the scale and frequency of outbreaks of multiple infectious diseases in the past 400 years without timely medical intervention. The study pointed out that in any given year, the probability of a pandemic with a similar impact as new coronary pneumonia is about 2%, and this probability is still increasing.
  Researchers found that with the exception of the new coronary pneumonia, the probability of an epidemic of a similar scale as the 1918 influenza pandemic (the pandemic that caused the highest number of deaths, causing more than 25 million deaths) per year is 0.3% to 1.9 %. In the next few decades, the probability of a new infectious disease outbreak may increase by three times; in the next 1,200 years, a pandemic that threatens all mankind may appear.

Why do sparks occur when plugging in or unplugging?

  The pair of plugs and sockets will “wipe out” sparks from time to time, which can be said to be “sprays” caused by electric current. The moment the electrical appliance is connected to the power supply, just like the sudden opening of the gate to release the water, a large starting current will be input. The peak value of the “surge current” formed by it is much larger than the stable input current. If it is not suppressed, not only electric sparks may be generated. In severe cases, capacitors and fuse resistors may be broken down and equipment may be damaged. However, under normal circumstances, this “surge” is fleeting, and the current will soon return to stability.
  When the plug is pulled out of the socket, and the current is suddenly cut off, the residual power on the plug contacts and the socket contacts will not disappear immediately. The contact piece is equivalent to the electrode, and the electric spark will be released when the electric potential difference is large enough. If the electrode can get a continuous high-voltage power supply, it can also break down the air and ionize the air molecules, forming a stable arc. The temperature of the arc can reach thousands of degrees Celsius, and the molten metal is not a problem. Electric sparks not only damage electrical appliances, but also cause safety hazards such as fire and electric shock. Therefore, many plugs and sockets have added designs to suppress electric sparks, such as adding current-limiting resistors, relay delay switches and other protective devices.

Why does the sealed rice grow worms?

  When the rice is left for a long time, some small bugs sometimes appear, which are called “rice elephants” because of the long mouthparts on the head. The rice container is clearly sealed. Where did these bugs come from? In fact, they have left offspring in the rice long before you buy it, and it is difficult to detect when you buy the rice. The rice elephant will use its mouth to make a deep hole in the grain, and then lay eggs in it, usually one egg per hole. After laying the eggs, the hole will be blocked with secretions. Then the larvae can incubate and grow without worry in this nursery. Finally, the pupa emerges as an adult, which is the adult rice elephant you see.
  What’s more puzzling is that the rice is so dry and it absorbs water. Does the rice elephant need to drink water in it? In fact, rice elephants do not want to be so dry. They naturally like humid environments. If there is a ready source of water, they will also drink it. But now that you have entered the rice tank, you can only increase revenue and reduce expenditure, including extracting limited water from the air and food, while reducing body surface evaporation and water loss in metabolic processes.

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