Dinosaurs 'lived for 300,000 years after Mexican meteor strike'

But I thought we knew everything there was to know about the dinosaurs and their extinction!?

;)

                   boing         boing         boing
       e-e           . - .         . - .         . - .
      (\_/)\       '       `.   ,'       `.   ,'       .
       `-'\ `--.___,         . .           . .          .
          '\( ,_.-'
             \\               "             "            a:f
             ^'