Knowledge: CDs need to be handled carefully as it is usually warned from MGM records while discs also need to be mindful when touching, according to the inventor, Emile Berliner.

Conversation:
I think I want to start collecting old phonograph records
I see. Did you know they're also called vinyl records as well? This classification excludes most made after WWII.
I like them and think they are a cool addition to my other collections but do not know much about them
Well, the way they work is they're an analog sound storage medium, right, and so it's a flat disc that has these spiral grooves that are inscribed and modulated onto the disc
Oh I had no idea it was so technical please tell me what else you know about phonograph records
Okay. The groove portion begins at the periphery usually. It then ends around the disc's center.
Ah interesting. I guess that's why you need to be careful like CDs. So who made phonograph records?

Response: Sure, it was invented by Emile Berliner.