What herb is traditionally hidden in Christmas pudding?

Holly

Who portrayed physicist Jane Hawking in the biographical movie "The Theory of Everything"? What famous composer wrote "Messiah," the musical work featuring the "Hallelujah" chorus often performed at Christmas? Who was the leader of Communist China from 1949 until his death in 1976? In mathematics, what symbol represents infinity? What is Winnie the Pooh's favorite food?