22:06The NewsroomImprovements in photosynthesis increase crop sizeBBC World Service Duration: 23 minutes Thu 17th Nov 2016, 22:06 on BBC World Service Americas and the CaribbeanScientists increase crop size by improving photosynthesis of plants; Tunisian victims of state human rights abuses speak out; the largest bank in the US finedGenresNewsFormatsMagazines & ReviewsBrandThe Newsroom Source: BBC Online