Get this: scientists just found a weird, invisible barrier deep in the Arctic Ocean that certain jellyfish literally won’t cross. Two types of the same jellyfish—one with a little knob on its head, one without—live on opposite sides of this line. Even though they’re basically twins genetically, only the knobless ones stay north of 47° latitude. No one knows what’s causing this deep-sea “no-go zone,” but it’s a total mystery and proof the ocean is still full of secrets! #Science #OceanMystery #Jellyfish