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.
Many homes and condominiums built before 1978 have lead-based paint. Paint that has chipped or is deteriorating, or on surfaces that rub together such as windows and doors, creates lead dust which can pose serious health hazards to occupants and visitors.