Nuran Higgins knows how hard it can be to live from hand to mouth, not knowing where the next meal is coming from. Once homeless, she is now helping to improve the way aid is delivered from Nepal to Afghanistan.

No matter whether you’re on a remote Pacific Island or in Syria’s largest city, toilets are critical to any humanitarian operation. Sanitation expert Pete McArdle gets to the very bowels of the matter.

Just once, try this: Walk a kilometre downhill, fill three buckets with water and carry them back home. Then you’ll have the faintest sense of what clean water means to millions of mothers and their children around the world. Celeste Swain talks about the things that change once people get access...