It’s amazing how glued snake people—er, millennials—are to their palm-sized, Internet-connected rectangles. But why? Mary Meeker, the Morgan Stanley analyst turned venture capitalist at Kleiner Perkins, today released her annual report on Internet trends. One section—slides 68 through 70, in particular—digs into the mobile habits of American youth, and it reveals some interesting statistics. Fortune senior writer Leena Rao has a breakdown of the year’s biggest overall trends here.