Advancements in simple cheap tech are the most fascinating to me. Cheapy ear buds. I have several. Some a couple years old, some a decade old, some as far back as the late 90s to early 2000. All in the "cheap AF" range. The sound quality difference is absolutely VAST. (tinny shit, listenable shit, and bassy not as shit. Theyre all still cheap buds. But still vast scale of cheap shit)