"Kevlar" Natural Recordings by Native Speakers
Kevlar is a brand name for a synthetic fiber known for its high strength-to-weight ratio, low elasticity, and resistance to heat, flame, and chemicals. It is often used to make body armor, clothing, and other products that require high levels of protection. The material was first developed in the 1960s by DuPont chemist Stephanie Kwolek and is named after her.
A kettlestitch is a type of sewing stitch used in bookbinding, typically to reinforce the sewing of pages together. It is a simple running stitch that is sewn in a zigzag pattern, creating a row of small, uneven stitches that add strength and stability to the binding. The name "kettlestitch" likely comes from the resemblance of the stitches to the coils of a kettle.