Ever picked up a random dog-eared, second-hand book on holiday.. and learned something? Ever picked up a surprising amount of knowledge without actually noticing how you did it?

From double-glazing sales techniques, to life tips for avoiding airport stress, to mastering the London Underground, and to Emotional Bank Accounts - Thembi and Jonathan share some stories of random learning and argue that they're all perfectly valid. Even if Thembi still calls it 'the silver line'.