Right; I forget how he worded it, but Sheldon did express amazement that Howard came up with the infinite loop fix- which caused Howard to express amazement (sarcastically) that Sheldon has trouble making friends.
So, if it’s a fuse panel from a rocket, I’m wondering who brought it home and put it on the column, Sheldon or Leonard? I think Leonard would be the more likely one- Sheldon is, after all, “more of a theorist”. I could see the DNA model belonging to Sheldon, but I think the rocket fuse board is Leonard’s.
Possibly it was a gift from Howard, the rocket engineer who sometimes works for NASA.
Leading to a conversation afterwards between Leonard and Sheldon about how you can’t just throw out gifts from friends you see regularly.