Biologists Just Found Out What the Piranhas in Lake Michigan Actually Are

Every summer, somebody hauls a flat silver fish out of the water near Lake Michigan, opens its mouth, finds a row of square human-looking teeth, and the word "piranha" is online before the fish is dry. Wildlife agencies across the Great Lakes have now had these fish in hand — on a table, under a microscope, and in some cases read straight out of the genetic code. What came back isn't the fish in the headline, and the stranger part is that the name biologists put in its place isn't holding up either. This is what's actually on the end of the line, how it got there, and why the real problem in these lakes is the one nobody bothers to photograph.