Stephen Davies has been living amongst Fulani herders in West Africa. He speaks Fulfulde, eats millet, and accompanies cattle-drives. He has been involved in the set-up of a Fulfulde radio station which will broadcast news, griot music and advice about cows, crops and health. He also writes for the Guardian Weekly (Letters from Burkina Faso) and occasionally for the Sunday Times. Have a look at his website: www.voiceinthedesert.org.ukZachary Mason is a computer scientist specialising in artificial intelligence. He was a finalist for the 2008 New York Public Library Young Lions Fiction Award. He lives in California.