Today's podcast topics deal with history - the history of emoji on iPhones, the FBI's poor opinion of Apple's excellent encryption, and an IPO for a company that Steve Jobs once unsuccessfully tried to buy:

• The designer of some of the first 500 emoji to be used on iPhones provides a ten-year retrospective on her work
• An FBI forensic expert frustrated with Apple's encryption refers to the company as "jerks" and "evil geniuses"
• Dropbox, the file-sharing powerhouse that Steve Jobs once referred to as a "feature, not a product", will be going public later this year