"Human Nature" directs to this page, if you were looking for the book of the same name - kill yourself.Edit
Teninch is trying to hide from the Family of Blood and uses a chameleon arch to turn him into a human. He transfers his Time Lord essence and memories into a fob watch and hides out on Earth in 1913, where he takes on the persona of John Smith, a teacher at Farringham School for boys.
He then bangs the chick from Spaced while Martha gets stuck as his maid (kek).
And FUCK OFF THE BOOK WAS BETTER