PBS Discussions Discussion Forums on pbs.org    Search   Register   Profile   Ignore List   Log in  T. Rex Blood?      PBS Discussions Forum Index -> NOVA scienceNOW: Stories 2007 View previous topic :: View next topic   Author Message NOVA scienceNOW4 Joined: 27 Dec 2006 Posts: 50 Location: Boston  Posted: Wed Jul 11, 2007 10:16 am    Post subject: T. Rex Blood? In 2005, scientists peering into the fossilized thigh bone of a 68 million-year-old Tyrannosaurus rex discovered something that by all accounts should not have been there: stretchy, soft tissue, including possible blood vessels and even red blood cells. The discovery sent shockwaves through the paleontological world, and since then, further work has revealed similar structures in fossils of other long-extinct animals. No paleontologist thinks we'd ever recover enough viable DNA to clone a dinosaur. But if we could extract some intact DNA from their fossils, do you think there should be any limits on the kinds of experiments scientists should be able to conduct with such ancient DNA? That is, should they be permitted to try to do anything they could with the DNA, including trying to clone it? Or considering dinosaurs went extinct long ago, and not through our agency, should we leave well enough alone? 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