After the commercial, Cuddy enters the classroom and all the students make "oh, shit!" faces. But none of them respond when Cuddy asks who Pilot is. 18, of course, asks if she's okay. Oh, just leave now and go vest shopping, 18. Really. Old Guy smarts off that House's answer to Cuddy -- that Pilot was "on the run from an international crime syndicate" -- was the same thing he told them. Cuddy tells them that if they want to work at PPTH, she has to approve them, and she won't if they don't tattle on House. 10 just learned the real meaning of extortion, and finally spills what he found out about Pilot from her apartment: "Name's Greta Cooper. Wants to be an astronaut. Doesn't want NASA to know her brain's getting her ears confused with her eyes. I went through her mail." Way to get House in trouble and confess to a federal crime, 10.

In the hall, Cuddy orders House to chart everything he does for Greta from now on. House goes back to the classroom and immediately fires 10. 10 gives his guilt away by saying, "She told you?" House says that he knew it was someone who was in Greta's house, and of the other two choices, 26 is old and napping, and 2 doesn't do anything. Also, Anne is pointing at 10. We are not treated to a shot of her semi-secretly pointing at 10, which is a real shame. It's also a shame that 10 got fired. He was cute.

House goes a-diagnosin' with his nineteen remaining Numbers, and the camera rack focuses constantly as they give their guesses or shoot those of others down. Kumar is quick to tell on Anne for putting Greta's lab information on her PDA against House's instructions to destroy all patient data, but House doesn't care. Meanwhile, Anne, if you're going to tell on others, you'd better make sure you aren't doing anything they can tell on you for. Also, Kumar gets fired for interrupting House's brilliance with stupid questions. Bye-bye, Kumar! The smile on Anne's face when this happens is kind of great. I should hate her for being such a weasel, but she's just so brazen about it!

House asks the remaining Numbers how they can test Greta without doing any chartable tests. 2 thinks they should do whatever tests are necessary to save Greta's life and ignore Greta's desire for no one to find out. Her seat neighbor, 36, looks as bored as he has all episode and has nothing to add. House gives them an hour to think of an answer while he goes off to bore me with some Wilson time.