Tin oxidizes less readily than iron due to differences in their chemical properties and place in the reactivity series. Tin (Sn) is less reactive compared to iron (Fe) and forms a passivation layer of oxide that protects it from further oxidation. When exposed to oxygen, iron reacts to form iron oxides, commonly known as rust, through a process that is relatively fast, especially in the presence of moisture. Tin, on the other hand, forms a stable oxide layer that adheres well to the surface, preventing further oxidation and corrosion. This is why tin is often used as a protective coating for metals, including iron and steel products, as in the case of tin-plated steel or cans. This protective layer is crucial for applications where resistance to corrosion is necessary. However, under certain conditions, such as acidic environments, tin can still corrode but at a much slower rate than iron.

Loose pigments are finely milled powder cosmetics used primarily for eye makeup, but they can serve multiple purposes including for lips, nails, and face products. These pigments are made from a variety of materials, including mica, which provides the shimmer and sparkle, iron oxides for red, brown, and yellow hues, ultramarines and chromium oxide for blues and greens, and titanium dioxide for opacity and whitening. The purity of color and intensity makes them highly versatile and customizable, unlike pressed eyeshadows that may contain binders and fillers to keep them compact. Artists and enthusiasts favor loose pigments for their vibrant colors and adaptability, though they can be messier and require a more careful application technique. Whether creating a dramatic eye look or a subtle sheen, loose pigments offer a high-impact option for those willing to master their use.

Ruminants digest cellulose through a sophisticated, multi-chambered stomach process involving microbial fermentation. The rumen, the first chamber, is home to a diverse microbial population that breaks down cellulose into volatile fatty acids (VFAs) through anaerobic fermentation. These VFAs are then absorbed by the ruminant and converted into energy. The microorganisms themselves become a source of protein as they move into the abomasum and small intestine, where they are digested by the ruminant's enzymes. This symbiotic relationship allows ruminants to extract nutritional value from cellulose-rich plant materials, which are indigestible to many other animals.