When I return through Earth's atmosphere in my Soyuz I will have spent 193 days in space. My mission will have been the longest European space flight in history. Everything went well thanks to the thousands of people on ground that continuously keep an eye on us. Safety is number one priority in human space flight. Missions such as mine are inherently risky. In the last few weeks I started an experiment that looks at one of these risks: Altea Shield. Read on...