Evidence of reproduction by internal fertilization has been discovered in a large group of ancient jawed fish. Embryos discovered within fossils of these animals confirm that live birth in prehistoric times was much more widespread than previously thought. Watch the researchers talk about the fossils and techniques used to find them.
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Treating cancer requires aggressive but targeted therapy. Some cancer drugs are too toxic because they damage healthy cells as well as tumor cells. So researchers are trying to develop ways to make sure drugs only ta...