Do we need a charm to get good luck? Or do we make it for ourselves? Penny Posner knows everything there is to know about good luck. Every day she wears her lucky bracelet on her wrist, her lucky socks on her feet, and Ferdinand, her lucky frog keychain, on her belt loop. And today she needs all the luck she can get so she'll be chosen to blow the shofar at the school's Rosh Hashanah picnic. But when she picks up a lucky penny,...