Advances in genetic engineering and cloning have brought us no closer to resurrecting the dinosaurs for one simple reason-DNA does not survive long enough.... The dinosaurs are estimated to have died some 66 million years ago when a six-mile-wide( 10km) asteroid struck the planet off the coast of modern-day Mexico.... DNA breaks down after some seven million years, so scientists are rather unlikely to find any genetic material in the fossil record. But not all hope is lost, according to Willia