 Welcome to People Fixing the World from the BBC World Service, a show that's all about solutions. And you could call me your solutions captain. I'm Mayra Nouby and every week I take you around the world to meet the people who are trying to fix some of the most pressing problems we face today. Now, this week we'll be visiting a 911 emergency call centre in the US and then trying a different kind of vitamin in Denmark, all to find out about new ideas