2. What is the case, the fact, is the existence of atomic facts.
August 1911, the English philosophers C.K. Ogden and Bertrand Russell are taking tea in Russell's faculty apartment. There is a knock at the door. Russell: "An unknown German appeared, speaking very little English but refusing to speak German. He had acquired, by himself, a passion for the philosophy of mathematics and has now come to Cambridge on purpose to hear me."

Though not enrolled at Cambridge, Ludwig attends Russell's lectures, dominates the discussions, then follows Russell to his rooms to argue more. Lord Russell: "My German engineer, I think, is a fool. He thinks nothing empirical is knowable - I asked him to admit that there was not a rhinoceros in the room, but he wouldn't."

But during the Michaelmas vacation of 1911 Ludwig writes a manuscript that impresses Russell greatly. Russell becomes his mentor, his friend, his guide in the social circles of the Cambridge elite.

Wittgenstein soon learns all Russell has to teach. Russell: "I love him and feel he will solve the problems I am too old to solve. He is the young man one hopes for. I find him strangely exciting."