I was watching an old Accu-Stats over the weekend from 1990, and along with a post I saw by hangthe9 in another thread, it got me thinking. We know there have been some technological advances in pool (jump cues, phenolic tips, layered tips, ld shafts) over time but they probably aren't as drastic as in some other sports like golf. However, it seems to me that pool is unique in that some strategies and techniques went years with almost no advancement and then recently things have changed quite a bit. 2 come to mind immediately. When I took up the game in the mid 90s jump cues were prevalent, but it was considered a good shot just to make a hit. Now it seems that when the jump cue comes out the expectation is for a make. The other is the 9 ball break. For so long guys were just slamming the break (often from near the headspot) trying to luck a ball. Now it's practically a science that has, in some people's opinions, ruined 9 ball as a pro game. What do you think the reasons are for this? Are there any other examples you can think of?