How is the Cloning of Human Cells Regulated?

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As the ban in Britain on human cell cloning for medical purposes is about to be lifted, a report on the ethical debate and international regulation of cloning. A 3.5 million-year-old skeleton Australopithecus africanus found in South Africa could change thinking on the origin of our species. Schoolgirls quiz cosmonauts on the Mir space station. Plus, measuring weather and why Mars is to be targetted by two new probes.