A jaw-dropping electric-blue man-of-war just showed up off Japan’s northern coast—way outside its usual hangout. Scientists are freaking out because this ‘samurai jellyfish’ is a totally new species, and its arrival is a major red flag about how fast ocean currents and temps are changing. It’s gorgeous but also a warning: our oceans are getting weird, and nobody’s sure what’s coming next. Would you swim with it? #Science #OceanMystery #ClimateChange