Hello all. I am not a student of science, in fact I'm relatively ignorant when it comes to most sciences in general. However, as a matter of personal interest, I have endeavored to understand a few things as they relate to my industry and some of the products that I sell. At the moment, I am writing a technical article (from the layman's point of view) on heat shrinkable polyolefin tubing. I have interviewed a couple of people in the industry and been privy to the basics from the pellet stage forward. But where I lack clarity is in the processes prior to pelleting the polyolefin product for extrusion. I have just two questions for the moment, but I'm sure they will lead to more if anyone is interested in discussing this with an ignorant plebeian. ;) •By what process do you separate post-cracked ethylene from the accompanying propene and other trace compounds? •Is a monomer an atom or a molecule? Sources such as wikipedia claim that a monomer "may be" an atom or a molecule. That seems very vague and contradictory. How can a monomer (meaning single part) be used to describe a molecule (multiple atoms?) Thank you in advance for any input you might offer. If there is a substantial contribution, I would gladly credit you in my paper. It won't be anything glamorous, but I suspect it will be viewed by more than a few thousand people over the course of a few years.