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.
What really caused the Silk Road was greed and the want of more land. Silk was very valuable at this time. No one in the world even knew about it or how to make it. It was so secret that if you told someone out of China how to make the silk you would be killed.