Severely malnourished children around the world could benefit from a supplement that only costs a few cents, writes Adrian Martineau.The current standard treatment for severe acute malnutrition is a high-energy food paste. Scientists have discovered that supplementing the paste with a high dose of vitamin D significantly increased malnourished Pakistani children's weight. It also significantly improved their motor and language development.

The Sahel is a vast region in Africa that consists of parts of Nigeria, Senegal, Mali, Burkina Faso, Chad and Cameroon, among other countries.There's been a long-standing conflict between pastoralists and farmers in the region, traditionally driven by tensions over access to natural resources. But there's mounting evidence to suggest a recent surge in armed killings can be traced to weapon inflows from Libya and Mali. Olayinka Ajala sets out how the crisis could be tackled.