2014 Science Breakthroughs of the Year: Fighting diabetes with stem cells.
WHEN SCIENCE MEETS HISTORY (Encore Presentation) - Ocean temperature records from a 19th century research ship confirm global warming. Reviving plants hidden under glaciers for centuries. Tracing the genetic origins of the blight that started the Irish Potato Famine. And uncovering evidence of lead pollution in Spain from 4,000 years ago.