Weft yarn refers to the threads that are woven horizontally across the warp threads in the process of making a fabric on a loom. The warp yarns are held taut and in parallel order, while the weft yarn interlaces with them perpendicularly. This interlacing process is fundamental to weaving, creating the structure and pattern of the fabric. The characteristics of weft yarn, such as material, thickness, and elasticity, can significantly influence the texture, drape, and strength of the resulting fabric. Weft yarn can be made from various fibers including cotton, wool, silk, or synthetic materials, allowing for a wide range of fabric types suited to different applications. The choice of weft yarn is crucial for both the aesthetic and functional qualities of woven textiles, making it a key consideration for weavers and textile designers.

Polypropylene (PP) is a type of plastic widely used in various applications, from packaging to automotive parts, because of its strong, lightweight, and versatile properties. When it comes to ultraviolet (UV) transmission, polypropylene allows very low UV light to pass through, effectively blocking most of it. This characteristic makes PP a good choice for containers and applications where UV protection is necessary to prevent degradation or spoilage of the contents. However, although PP blocks UV radiation naturally, it's not inherently UV resistant. Prolonged exposure to sunlight can cause PP items to degrade, losing their strength and color. To enhance UV resistance, additives can be incorporated into the polypropylene during its manufacturing. These additives absorb or block UV radiation, extending the material's life when exposed to sunlight.

Titanium dioxide has been found to exist naturally on both the Moon and Earth. It was not brought to the Moon through any external means. but rather was formed through a comparable process that occurred around 455 to 100 million years ago in both bodies. As the Moon is believed to have originated from the remnants of a collision between Earth and a Mars-sized object. its composition shares similarities with that of Earth. Notably. the volcanic regions of the Moon have especially high concentrations of titanium dioxide. The lunar highlands. created by past volcanic eruptions. have particularly elevated levels of titanium.