One of the most famous tenets of Google life has been the idea of "20% time", which dictated that 80% of your time working at Google would be spent on company mandated projects, and 20% of the time (or one day out of five) could be used to work on whatever projects you wanted to. The 20% Time list of products is pretty impressive, including (most famously) Gmail, AdSense, GTalk, Google Sky, and Google News...Source: http://www.phonearena.com/news/Googles-famous-20-time-which-created-Gmail-GTalk-and-Google-Sky-may-be-dead_id46492
