On Wednesday, America’s star astrophysicist sent out this tweet: “Earth needs a virtual country: #Rationalia, with a one-line Constitution: All policy shall be based on the weight of evidence.” Jesse Singal explains that “it is, in fact, a pretty dumb tweet – uncharacteristically so, given how smart the author is – but one which usefully sums up a common misconception held by folks who bang the drum loudest for science and reason.”