This study underscores the need to monitor vascular changes in astronauts. Christopher Mason More Quotes by Christopher Mason More Quotes From Christopher Mason You can see a molecular echo of what’s left behind. Christopher Mason health The small traces of human DNA left behind on surfaces serve as a mirror or echo of people who move through that station. Christopher Mason health In the case of the plague, we see fragments associated with the plague but not strong evidence of the plague itself. Christopher Mason health The majority really of everything you touch represents a very healthy ecosystem that mirrors what’s on your own skin. Christopher Mason health