In May 2009, Google engineer Matt Cutts tried to walk 10,000 steps a day for 30 days. Happy with the results, over the many months since then has continued to challenge himself to try something new for 30 days. So far he has tried not watching television, biking to work, reading 15 books (but only got through 12), no caffeine, taking one picture a day and many others. Matt has a blog where you can follow his 30-day challenges and vote on what he should try next. According to Matt, 30 days is enough time to build a habit. What habits would you build or break? We’re curious to hear what you would try.