Original Post from Johan Strandberg: Exoplanet conference fail US purity test Stupid ban on Chinese nationals at NASA facilities harm science. Luckily key researchers recognize stupid when they see it and are boycotting a major conference. Given that this originated with congress, I don't see much chance of a speedy reversal. (Of all the laws they could have passed these last years, that had to be the one?)  Nasa facing backlash from US researchers due to rejection of Chinese nationals from conference - mjc