This week how heart bypass could be as simple as having an injection. Anya Sitaram reports from Boston on the American doctors who are injecting a growth factor around the heart in an attempt to encourage new blood vessels to grow and ultimately avoid the need for heart bypass surgery.
Plus the first of two reports in which Craig Doyle takes part in tests to determine whether people in less than perfect physical condition actually make better astronauts than superfit candidates.
Producer Daniel Barry ; Editor Saul Nass6
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