12 minutes is all the exercise you need each week. i agree. 12 minutes of high intensity exercise can keep you fit and healthy. thank goodness. >> you don't have to prance that much. the national spelling bee title goes to a 13 year old who has struggled with german words at past spelling bees but not this time. >> knaidel. >> german derived yiddish. >> k-n-a-i-d-e-l. >> well played. that's the champion. he joins us now. congratulations. >> thank you very much. >> do you know what a knaidel