Vienna is known for its high quality of life. Jewellery and engraved gems of high quality were produced. Obsidian is capable of producing an edge sharper than high quality steel razor blades. Distilled absinthe employs a method of production similar to that of high quality gin. Therefore, orgasm increases the chances of conceiving with males of a high genetic quality. Understanding such properties is essential to making quality steel. Scientists are developing strategies to enhance silk quality and quantity. This includes decreasing rates of smoking and improving indoor and outdoor air quality. It is part of Uniform Tire Quality Grading standard. Consumers may regard certain cultivars as "premium" quality. These are guidelines for software structural quality. Saffron is not all of the same quality and strength. There were many kinds of bread of differing quality. Some species produce winged progeny in response to low food quality or quantity. Clonal amplification is important for quality control purposes.