One of the reasons, I assume, it is difficult to gain access to the US, even for teams of student-scientists, is because of things like this happening https://w

One of the reasons, I assume, it is difficult to gain access to the US, even for teams of student-scientists, is because of things like this happening https://www.usatoday.com/story/news/world/2017/07/23/mystery-deepens-after-african-teens-vanish-u-s-robotics-fair/502903001/ https://www.usatoday.com/story/news/world/2017/07/23/mystery....