Eric Weinstein @EricRWeinstein
Weird but great and devious question. Assume that the underlying spacetime were topologically rich. Then it would be quite likely that it would carry no Flat metric by some Gauss Bonnet type theorem. If the Einstein curvature couldn’t vanish it would have to be balanced… — PolitiTweet.org
Hank Green @hankgreen
Hey Physicists...should stuff exist? Like...wouldn't it make more sense if it...didn't?