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As the World Health Organisation declares the birth defects linked to the spread of the Zika virus a global public health emergency, virology professor Jonathan Ball explains the nature of the virus.

Live from the Iowa caucuses as US presidential candidates jostle to gain momentum in the race for the White House

Natalie Jamieson & Vanessa Thorpe discuss the arts and entertainment stories of the week in Back Row, including the Screen Actors Guild Awards and ELO revealed in the legends slot at Glastonbury.
And Professor Tim O'Brien answers listeners' questions about space, including black holes, space lasers, growing space seeds and faxing pictures from the moon.