One more from Detective Comics #33 before we move on. After the origin story is over, this issue also reveals that Bruce Wayne has a secret lab behind a fake bookcase in his house. It's no Batcave - and for some reason he's still keeping his Batman costume in a trunk in the main part of the house (either that, or there's a large window in his "secret" lab) - but it's movement in that direction and an important development.
