"When I ... left Hogwarts, it was 2006," she says. "I wasn't teaching there, but -- yes, I do like teaching, actually." It's a fact which never ceases to amaze her, frankly. "As for the Disc ... it's a flat planet carried on the backs of four elephants, who in turn stand upon the back of the cosmic turtle Great A'Tuin." She smiles. "Being from there seems to have been good preparation for all manner of strangeness."