We talk to Dr. Ulrich Wahn about the causes of and therapies for chronic inflammatory disease of the airways, and how lifestyle changes can help sufferers prevent asthma attacks.
US regulators have approved a breakthrough treatment that genetically engineers patients' own blood cells to fight childhood leukemia. Experts say it may open the way to treating other cancers with a similar procedure.
Cities across Europe are reeling from deadly terrorist attacks. While they're relatively new in Europe, terror attacks have long been a reality in cities in Asia or Africa. How can cities be made safer?
The UK has raised its terror threat level to critical, meaning an attack is expected soon. The "Islamic State" said it was linked to the blast that injured 29 people in a crowded London Underground train.
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