Astronaut Greg Chamitoff, aboard the International Space Station 220 miles above Earth, is taking your questions. Here's your chance to hear direct from space. Chamitoff's schedule will not allow him to answer many questions, but he will attempt to answer a few each week. To submit your question, go to www.nasa.gov/ask!Dick Kashdin, 65, of Clarence, New York asks:What is the most stressful and the most pleasing part of your daily routine?