No, Scott Kelly’s year in space didn’t mutate his DNA. There is a lot of VERY bad reporting on this. Top photo from here – Mark Kelly on the left, and Scott on the right.
A good proposal for how Britain might respond to the Salisbury nerve agent attack. Another possibility: Take Putin to the International Criminal Court. Some basic information about nerve agents. Legal basis for options. Decoding the Prime Minister’s speech. Background on Sergei Skripal.