Couples in Mexico tend to engage in a decent amount of PDA. It's easier to ask people out in the United Arab Emirates because many are foreigners. Dating in Australia doesn't have many rules, but that doesn't mean that anything goes. Dating in India is more conservative than many other countries. Relationships in Italy are heavy on the romance.
The gramophone sat in your parlor and certainly couldn't be carried along with you and you like an mp3 player. When 78 rpm records first appeared on the market, they were very rare. When they became popularly available, you could find them everywhere; but then the technology changed and they became rare again.
That's change over time.
Prince - Purple Rain (Official Video)
Archaeologists investigate trash, not shop window displays, so we measure things when they are discarded; in this example, we're going to use junkyards.