0Get Schooled in the 'History of Rap'Get your glasses (and your MC Hammer pants) on, everybody: Jimmy Fallon and Justin Timerlake warned that the latest installment of 'History of Rap' would be their last. But why end the semester early when you've still got half the syllabus to go?Updated Apr. 24, 2017 2:28PM EDT / Published Oct. 29, 2011 10:00AM EDT