THEY ARE NEIGHBORS AREN'T THEY. If nothing else they've probably crossed paths waiting for the tram (awkwardest wait, seriously no one wait for public transportation with Sherlock if you can avoid it it is the awkwardest experience for both of you).

I'm planning on making a post people can tag into sometime soon -- we could always do that? I'mma think of ideas. But I agree, sciencey characters need to talk, Sherlock is considerably more tolerable with people who have interesting things to say! By his definition of interesting, that is.