“Next stop: Leiden University Faculty of Law!” Returning to a place from one’s old life is always a complex experience. Back when I lived in Leiden, I was attached to the law faculty, housed in Kammerlingh Onnes’s old lab. If you had told me then that a decade and a bit later I would be back, but as a data scientist working with a client nearby, I would have laughed. Data science wasn’t even a thing back then, and while I was always into statistics and maths, I never saw myself doing it as a career until (relatively) quite recently. And so, to return to a town that holds all these memories from a past life is strange to say the least. Strange – but not necessarily unpleasant!