Yesterday I went for a walk with my son Josh. I told him I was planning a gathering for some friends, and one of them is allergic to tree nuts. I know that walnuts and pecans grow in trees, but since peanuts grow in the ground I wondered if that would be a different category of allergen. I mused aloud as we walked, realizing that I don’t know which nuts grow in trees and which ones don’t. I told Josh that I really like Brazil nuts, but I don’t know where they come from. With his usual grin, he told me, “Mom. They’re from Brazil!” And then he looked at me like I was nuts.