That's really not a solution to the original problem, just a short-term solution for this one conference. From the mail by Mark Messersmith it looks like the ba

That's really not a solution to the original problem, just a short-term solution for this one conference. From the mail by Mark Messersmith it looks like the ban applies to all conferences held at a NASA building, so if the NASA ever wants to have chinese participants at one of them they'd have to hold it outside of their own buildings.