Think you get into some oddball email threads with your coworkers? That's nothing next to what's happening in Melbourne, Australia's green spaces. The city gave email addresses to trees in 2013 to help deal with broken branches and other issues, but it now finds that many people are striking up conversations with these leafy residents about everything from their looks to the weather. In some cases, the trees (okay, city staff) reply back. Want to know what a cedar thinks of the Greek debt crisis? Ask it -- you might just get an answer.