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Curiosity Tea ☕️: post #5838 — TG.ME

Curiosity Tea ☕️@Curiosity_Tea · 76.9K subscribers Open in TelegramOpen

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What is Xenon Doping and how does it trigger the EPO hormone in the body? Xenon doping refers to the use of xenon gas (Xe) to artificially stimulate the body’s oxygen-response system, mainly with the aim of improving athletic performance. Xenon is a colourless, odourless noble gas. It has been prohibited by the World Anti-Doping Agency (WADA) as a hypoxia-inducible factor (HIF)-activating agent. The important mechanism involves erythropoietin (EPO), a hormone produced mainly by the kidneys that signals the bone marrow to make more red blood cells. Xenon exposure can activate the HIF pathway, which is normally switched on when the body senses low oxygen. This can increase EPO levels and potentially stimulate red-blood-cell production, improving the blood’s oxygen-carrying capacity. A controlled human study found that xenon exposure increased EPO levels, although later research found that longer-term exposure did not necessarily improve athletic performance. 4.1K·Aug 19 Why are some systems based on the number 12 (dozen, 12-hour clock, 12 inches in a foot)? The repeated use of 12 is mainly due to its high divisibility and historical adoption in early civilizations. Mathematically, 12 is a highly composite number with divisors 1, 2, 3, 4, 6, and 12, making it easier to divide quantities into equal parts compared to 10, which has fewer divisors. This property made 12 practical for trade, measurement, and daily calculations in pre-decimal systems. For example, a dozen (12 items) can be split evenly into halves, thirds, or quarters without fractions, which was convenient in marketplaces. Historically, the use of 12 is linked to ancient Egyptian and Mesopotamian systems. The Egyptians divided the day and night into 12 parts each based on observable celestial patterns (sun movement and star groups), giving rise to the 24-hour day with two sets of 12 hours. Similarly, the duodecimal (base-12) counting method, supported by finger segment counting (12 segments on four fingers using the thumb), influenced early measurement standards. The Roman and later English systems adopted 12 for length (1 foot = 12 inches) because it allowed easy fractional division in construction and land measurement. Thus, the consistent use of 12 is not arbitrary; it is a result of mathematical efficiency combined with historical standardization in early scientific and commercial practices. 15.3K·May 2 Do vehicles have a passport for international travel? Vehicles do not have a passport in the same way humans do, but for international road travel they require an equivalent document called the Carnet de Passages en Douane. This document acts as a “passport for the vehicle” and is recognized in many countries worldwide. It contains important details such as the vehicle’s registration number, engine and chassis numbers, and the owner’s identity. Its primary purpose is to assure customs authorities that the vehicle is being temporarily brought into a country and will not be sold or permanently imported there. The Carnet also serves as a financial guarantee, allowing travelers to avoid paying heavy import duties at each border crossing. It is issued by authorized automobile associations in different countries and is usually valid for a limited period (often up to one year). During travel, customs officials stamp the Carnet at every entry and exit point, similar to how passports are stamped for individuals. This process ensures proper tracking of the vehicle across borders. Therefore, while vehicles do not have an actual passport, the Carnet de Passages performs the same function and is essential for smooth international road journeys in many parts of the world. 12.1K·May 1 Why ships are painted red below the waterline? Ships are painted red below the waterline mainly to prevent biofouling, which is the accumulation of marine organisms like barnacles, algae, and mussels on the hull. This growth increases surface roughness, leading to higher hydrodynamic drag, reduced speed, and significantly greater fuel consumption. To counter this, ships use anti-fouling paints, traditionally containing copper oxide, which slowly releases biocidal substances that inhibit the attachment and growth of such organisms. The red color commonly comes from these copper-based compounds, making it both functional and conventional. By keeping the hull smooth, ships maintain better efficiency, saving fuel and operational costs. Additionally, the coating acts as a protective barrier against corrosion, since seawater is highly corrosive to steel hulls due to electrochemical reactions. The paint prevents direct contact between metal, water, and oxygen, thereby reducing rusting and extending the ship’s lifespan. The red color also provides good visibility during dry docking inspections, helping engineers easily detect damage, fouling, or wear. Over time, red has become an industry standard due to its proven effectiveness, cost efficiency, and ease of maintenance, although other colors may also be used depending on specific paint formulations. 11.3K·Apr 27 Why do sharks not have a single bone in their body? Sharks do not have a single bone in their body because their entire skeleton is made of cartilage, a strong yet flexible connective tissue. Sharks belong to a group of fishes known as cartilaginous fishes, which evolved much earlier than bony fishes—over 400 million years ago. At that stage of evolution, cartilage provided sufficient structural support without the need to develop true bones. This cartilaginous skeleton offers several biological advantages. Cartilage is lighter than bone, which helps sharks maintain buoyancy in water since they lack a swim bladder. It is also more flexible, allowing sharks to swim efficiently, make sharp turns, and absorb sudden shocks during high-speed movement or while attacking prey. Although sharks have no bones, their cartilage is often partially calcified, especially in the jaws and spine, making it strong and durable. Their teeth are also not bones; they are made of dentin covered with enamel and are continuously replaced throughout life. 21.2K·Feb 27

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