Pipe Thread Types and Designations. Overview: Different types of screw threads have evolved for fastening, and hydraulic systems. Of special concern are plastic-. to-metal, taper/parallel threaded joints in hydraulic circuits.
The taut Mike Nichols drama Silkwood (1983) was based on the real life case of a plutonium processing plant metallurgy worker, Karen Silkwood (Meryl Streep), who discovered corporate powers were covering up radiation leaks at Oklahoma's Kerr-McGee plant.
Another less romantic but more convincing explanation is that some ancient Chinese women found this wonderful silk by chance. 1  When they were picking up fruits from the trees, they found a special kind of fruit, white but too hard to eat, so they boiled the fruit in hot water but they still could hardly eat it.