The statement that a filament yarn is made only from manmade fibers is inaccurate. While it is true that many filament yarns are produced from synthetic materials like polyester, nylon, and acrylic, there are also natural filament fibers. Silk is a prime example of a natural filament fiber; it is produced by silkworms and can be spun into filament yarn without the need to cut or staple the fibers. In contrast, staple fibers, which include most natural fibers like cotton and wool, are short and must be spun together to make yarn. Filament yarns offer a smoother and shinier appearance, which is why they are often used in the manufacturing of sheer fabrics, hosiery, and performance wear. However, the broad scope of materials, both natural and synthetic, that can be made into filament yarn highlights the versatility and diversity of textile production.

A "yarn crossing" can refer to a couple of things depending on the context. In textile and knitting, it describes the point at which two strands of yarn overlap or intersect, such as in weaving, braiding, or knitting processes. This crossing is essential for creating fabric structure and patterns. In transportation or logistics, though less common, it might metaphorically describe a busy interchange or junction where paths of distribution (like routes for transporting yarn or textiles) intersect. The specific nature of a yarn crossing greatly depends on the context in which it's mentioned, emphasizing the importance of the interconnection either in creating textile products or in the movement of goods.

To perform a purl yarn over (YO), which adds a decorative element and increases stitches in your knitting, follow these steps. First, ensure you're at the point in your pattern where a purl YO is required. Begin by bringing the yarn to the front of your work between the needles as if to purl. Insert your right needle into the next stitch on the left needle from right to left (as you would for a regular purl stitch). However, instead of wrapping the yarn around the right needle and pulling through the stitch, simply let the yarn drop down over the needle and the stitch. This creates an extra loop or "yarn over." Continue with the next stitch in your pattern. When you come to the purl YO on the following row, treat it as a knit stitch to avoid twisting the yarn over.