These health rumors, wildly shared by parents and seniors who are into wellness over the years, how many have you believed? Perhaps you, being so savvy, just dismiss them with a laugh, but your parents and relatives could be harmed by these misguided health myths at any time! Take these simple truths seriously. The more people who know, the fewer misunderstandings there will be.
Is the frequent "gun jump" at gas stations a trick for the station to make more money?
Truth: National regulations stipulate that the nominal capacity of a vehicle's fuel tank cannot exceed 95% of its actual maximum capacity. Gasoline is a volatile substance and also expands with heat and contracts with cold. To prevent fuel spillage, automakers always specify a tank volume that is smaller than the actual volume. Moreover, the gun jump is not necessarily because the tank is full; it is directly related to the tank's structure and the size of the air resistance inside the tank during refueling, and it does not affect the amount of fuel dispensed.
Can underfloor heating produce "heating radiation" that is harmful to the human body?
Truth: There are two types of underfloor heating: electric and water-based, with the latter being more common on the market. Water-based underfloor heating is a system that circulates hot water between 35°C and 50°C through laid heating pipes to release heat into the indoor environment. Water-based heating heats water, which is not harmful to the human body. Electric underfloor heating involves burying cables underground, similar to an electric blanket, to generate heat through electric current. The magnetic field from underfloor heating is far from the intensity required to cause human diseases.
Do mobile phones and Wi-Fi radiation cause cancer?
Truth: The power of Wi-Fi is not high, and the radiation after passing through a wall is almost negligible. Experiments show that mobile phone radiation peaks at 4.0 milligauss during a call. When you are 15 cm away from the phone, its peak value is only 0.3 milligauss, which is basically zero after subtracting the environmental radiation value. As long as the radiation intensity does not exceed 833.3 milligauss, it is safe.
Is the radiation from subway security scanners large and very dangerous?
Truth: According to national regulations, the dose from a single X-ray security scan should not exceed 5µGy. In reality, the radiation dose from X-ray security scanners used in subways and airports is much lower than the national standard, so sticking your hand in is not "extremely dangerous".
Are babies born in the Year of the Sheep destined for a bad life?
Truth: According to research, the saying "Nine out of ten Sheep are incomplete" was a political strategy to overthrow the Empress Dowager Cixi. Because the Empress Dowager Cixi was a Sheep, to overthrow her, the people began to claim that those born in the Year of the Sheep had bad luck. The zodiac sign is merely an identifier and has no connection to a person's destiny. Associating the zodiac with fatalism is a pseudo-science from the old era. Furthermore, if everyone rushes to have a baby after the Year of the Sheep, it could lead to a strain on social resources such as education and healthcare, which is not conducive to the child's growth and development.
Are long johns a tool promoted by the Soviet Union to weaken the Chinese people's ability to survive?
Truth: In fact, the practice of wearing two pairs of pants can be traced back to around the 8th century in the West. Moreover, long johns and other warm clothing cannot have a hereditary effect on human "cold resistance." Many countries around the world wear long johns.
Can blood drops be used to confirm kinship?
Truth: There is no scientific basis for identifying relatives by mixing blood. When blood of different types is mixed, antigens and antibodies of the same type will bind to form a precipitate, while blood of the same type will "fuse." However, whether the blood type is the same or not is unrelated to whether the individuals are biologically related. Dropping blood directly into clear water will actually cause the red blood cell membranes to rupture, preventing a large amount of antibody binding, and no visible precipitate will be produced regardless.
Will sweating it out cure a cold?
Truth: Doctors explain that some colds can cause fever, and sweating a bit can give the body's "heat pathogen" an outlet. However, exercise-induced sweating is not suitable. Sweating also does not help with other cold symptoms like nasal congestion and cough. Clinically, not all colds cause a fever and do not require sweating as a treatment. For example, the "deficiency-type cold" in traditional Chinese medicine can actually worsen symptoms after profuse sweating.