With the help from Illinois kids, the UnitedHealthcare Children’s Foundation (UHCCF) has collected knock-knock jokes and riddles for two new joke books that will be released October 2nd on World Smile Day. The joke books not only provide smiles and laughter, but also help local families in need as the proceeds from the books will be used to fund child medical grants. “Little Book – Big Laughs” Riddle Book and “Little Book – Big Laughs” Knock-Knock Book include more than 350 knock-knock jokes and 500 riddles submitted by kids – for kids. The books are ideal for children ages 4 to12, but will be enjoyed by all ages. For more information, visit www.uhccf.org.