Something strange is happening to the oceans. As coral reefs wither and fisheries collapse, octopuses are multiplying like mad... cephalopods—squids, octopuses, cuttlefish—are booming, and scientists don’t know why. An analysis published today in Current Biology indicates that numerous species across the world’s oceans have increased in numbers since the 1950s. “The consistency was the biggest surprise,” said lead study author Zoë Doubleday of the University of Adelaide. “Cephalopods are notoriously variable, and population abundance can fluctuate wildly, both within and among species.”