In TANDEM with learning the KNOWLEDGE also learn some important Historical facts about the Great City you will be working in once you attain that coverted GREEN BADGE. You dont want to sit in your CAB and be asked a question that you cant answer; this will make you look dumb and unintelligent. Being able to give reasonable answers, and good and reliable information is the difference between a GOOD CABBY and a BAD ONE , and a GOOD TIP && NO TIP !!!!