How do bonds work and how can you invest in them?

Chuck Zodda and Mike Armstrong discuss Apple's Tim Cook making a surprise visit to China as iPhone sales slump. Heating your home should cost less this winter, unless you live in the Northeast. Earn 4.5% with no taxes? How to invest in municipal bonds. How do bonds work? Amazon promises quick turnaround pharmacy to doorstep prescriptions via drone. Paul LaMonica joins the show to chat about the recent activity coming from Proctor and Gamble. X, formerly Twitter, will launch two new subscription tiers, Elon Musk says.