Gellert thought for a moment. First thing he thought was that a brother thinking his brother was odd? Was that normal?
"Well, I hope it's in affection he thinks of you as odd." He paused deliberately before continuing. "Divination is actually one of the oldest forms of magic, with herbs and such. Herbology was after Divination using herbs to actually use as charms and for characters on their own. It's been morphed in the years to be one thing or another, include other things, but it is still Divination."