Wool is neither cotton nor merino wool. Wool is a natural fiber that comes from the fleece of sheep, while cotton is a natural fiber that comes from the cotton plant. Merino wool, on the other hand, specifically refers to wool that comes from the merino breed of sheep, known for producing fine, soft, and high-quality wool. So, wool and merino wool are both types of wool, but they are not the same as cotton. **

Mineral wool, rock wool, and glass wool are hanging under the oven to provide insulation and prevent heat loss. These materials have high thermal resistance and are able to withstand high temperatures, making them ideal for insulating the underside of the oven. By hanging these materials, the oven is able to retain heat more effectively, resulting in improved energy efficiency and cooking performance. Additionally, the insulation helps to protect the surrounding cabinetry and flooring from excessive heat. **

Wool sweaters and pure wool leggings, such as Lopi wool, should be washed infrequently to maintain their quality and shape. It is recommended to wash them only when they are visibly soiled or have absorbed odors. Typically, wool garments can be aired out and spot cleaned to maintain freshness between washes. When it is time to wash them, it is best to hand wash them in cold water with a gentle wool detergent and lay them flat to dry to avoid shrinking or stretching. **

Rock wool, also known as mineral wool, is generally considered safe for human health when used properly. However, prolonged exposure to airborne rock wool fibers can potentially cause respiratory issues such as coughing and irritation. It is important to use proper protective equipment, such as masks and gloves, when handling rock wool to minimize the risk of inhalation or skin irritation. Overall, when used in accordance with safety guidelines, rock wool is not considered to be dangerous for the human body and health. **

As an AI, I don't have personal preferences, but I can tell you that wool sweaters made from sheep's wool are popular for their warmth, durability, and natural insulating properties. Many people appreciate the softness and comfort of wool sweaters, as well as their ability to keep them warm in cold weather. However, some individuals may have sensitivities to wool or prefer alternative materials for ethical or environmental reasons. Ultimately, whether someone likes wool sweaters made from sheep's wool is a matter of personal preference. **

Real acrylic wool is not as good as sheep wool in terms of warmth, softness, and breathability. Sheep wool has natural insulating properties that make it warmer than acrylic wool, and it is also softer and more comfortable to wear. Additionally, sheep wool is more breathable and has moisture-wicking properties, making it a better choice for regulating body temperature. While acrylic wool may be more affordable and easier to care for, it does not offer the same level of quality and performance as sheep wool. **

Steel wool is easily flammable because it is made up of very fine, thin strands of steel that have a large surface area relative to their volume. This allows oxygen to easily access the iron in the steel wool, which is necessary for combustion. When exposed to a flame or heat source, the iron in the steel wool reacts with the oxygen in the air, producing heat and light, and igniting the steel wool. Additionally, the thin strands of steel wool can quickly heat up and reach their ignition temperature, making them highly flammable. **

Dark spots on a sheep wool blanket in nature are likely to be caused by the presence of lanolin, a natural oil produced by sheep to protect their wool from the elements. These dark spots can also be a result of dirt, dust, or other environmental contaminants that have become trapped in the wool fibers over time. In some cases, dark spots may also be a natural variation in the color of the wool itself, caused by genetic factors or environmental conditions during the sheep's life. **