"Hmmm.." Sherlock made a non committal noise while he listened to John. It did indeed sound like an interesting job. He did some traveling to chemistry conventions and such, but mostly he stayed here in London. It kept him busy enough.

When it looked like John wasn't going to say any more, he looked over to Mrs. Hudson and talked with her for a bit, about a convention he had just attended and how everyone there was a moron for not knowing about the new chemical polymer that was being used to create better artificial hearts. He wasn't a doctor, but he understood the importance of what this scientific breakthrough could mean.

Eventually, the tea ran cold, and Sherlock was telling Mrs. Hudson that he needed to get back to his flat. He had an important paper to write. He stood up, giving this new man at the table a once over, one more time.