Think you need to be rich to travel the world? Think again. Travel reporter Andrea Sachs recently profiled professional budget traveler Matt Kepnes, a.k.a. Nomadic Matt, on how he travels the world on $75 a day. That covers all expenses, including international flights, ground transportation, lodging, food and activities. So how can you travel like Matt? Join him and Andrea for a live chat on Tuesday at 11 a.m. Eastern time. Send in your questions in advance through the box above. Your questions may be edited for accuracy and clarity.