Iranian activist wins Nobel Peace Prize

This year's Nobel Peace Prize has been awarded to the jailed Iranian activist Narges Mohammadi. We'll hear from someone who's known her for twenty years.

Also in the programme: A Ukrainian member of parliament tells us that she is - as she puts it - "desperately worried" about future levels of American military support; and new evidence that the first humans in North America were not quite as destructive as first thought.

(Photo: Nagres Mohammadi, pictured here in 2007, is serving a lengthy sentence in Evin prison. Credit: Getty Images)