Where did all the dinosaurs go? Were their eggs really devoured by the newly-emerged mammals? Or did they succumb to some Velikovskian catastrophe?
John Maddox discusses with Drs Luis and Walter Alvarez and their colleagues of the University of California. Berkeley, why they believe that 65-million years ago a huge meteorite ploughed into the earth's surface. leading to the untimely demise not only of the dinosaurs, but of three-quarters of the earth's plant and animal species.
Producer ALISON RICHARDS