This week on the Ask Lifehacker podcast, we’re learning how music affects your ability to work, getting great deals on mobile apps, and protecting your passwords on public Wi-Fi networks. Also, Facebook blows a billion dollars on Instagram, terms of service contracts are no longer the ironclad documents companies wanted them to be, and a whole lot more. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.