First of all I'd like to commend the writers on the Geology Methodology. Personally I think it's the best episode of the season so far,AND one of the best overall.

I love Ruchi for two reasons. First she's diabolically cynical. It's become a common trope in romantic comedies: the cynic who believes love is purely biochemical meets someone , falls in love, and it changes their mind. It's the plot of about 1000 movies ( 27 Dresses anyone?)

NO, I don't think Raj is going to change her mind but I think the contrast in the way they think and approach relationships is providing a spark through sexual tension. It's going to be a mostly physical relationship and she's probably going to break his heart which sucks for Raj who's batting well below the Mendoza line with women already.

The second reason I love Ruchi Is because she's clearly heavily into sports. You don't see many women in TV shows hitting up bars by themselves to watch sports, it's usually a woman who's a tomboy and is in a predominantly male social group.

Im Not claiming there are any feminist undertones there but that's a nice subtle touch by the writers to go against what's typical on TV.

Another point : Sheldon's attitude sucks. No scientist worth his or her salt degrades other sciences as unimportant. And I'm not counting researchers who reject the practically of certain scientific practices and have reasons to do so ,like rejecting another presented hypothesis... or trying to disprove something...that's different and part of the job. What Sheldon does is Anti-intellectual.There can never be an unimportant science and no scientific endeavor should be scoffed at.

Just because Geology isn't as academically glamorous as Physics or Chemistry doesn't mean it isn't significant or impactful.