Horizon meets Dr Mary Schweitzer, who may have found traces of DNA within the fossilised bones of a Tyrannosaurus rex - a discovery that could revolutionise our understanding of these beasts. Show more
Discover 11,128,835 listings and 277,807 playable programmes from the BBC
Horizon meets Dr Mary Schweitzer, who may have found traces of DNA within the fossilised bones of a Tyrannosaurus rex - a discovery that could revolutionise our understanding of these beasts. Show more