`Big bang' theory on dinosaurs

London - Some big dinosaurs often tripped and broke their ribs while chasing their prey, New Scientist magazine said yesterday. Mr Bruce Rothschild, of the Arthritis Centre of Northeast Ohio, in Youngstown, said he X-rayed fossil skeletons and found that ribs from some specimens of a smaller species showed the kind of fractures which would have been caused by a belly flop on to hard ground while running.