'Knock on Wood' Knowledge Cards

Test your know-how on common customs with these knowledge cards.  Each card in this 48-card quiz deck is packed full of information on the origins of daily events that we take for granted.  "Why are horseshoes considered lucky?" "Why do brides wear white and mourners black?" "Why do we leave teeth under the pillow for the tooth fairy?"  to name a few. With the questions on the fronts of the cards and the theories on the backs.