1 For a thinner stitch, less material is woven together.  Elasticity - Stitches on your knee need to be more elastic than those on your forearm, because your knee must be able to bend. Without proper elasticity, the stitches can snap and come out, or even tear the wound and delay healing.
1 Through the 1950s and 1960s, the use of exterior lead-based paint declined significantly, and ended by the early 1970s. 2  In 1971, the federal Lead Poisoning Prevention Act was passed.  In 1978, the federal government banned consumer uses of lead paint.
Effective January 1, 1996, the Clean Air Act banned the sale of the small amount of leaded fuel that was still available in some parts of the country for use in on-road vehicles. EPA said fuel containing lead may continue to be sold for off-road uses, including aircraft, racing cars, farm equipment, and marine engines.