The United Nations says that by the end of October, the world's population will surpass seven billion. The world population is now growing by roughly 80 million people per year. The tiny African nation of Zambia is among many nations around the world experiencing a population boom. Thirteen million people now live in Zambia, compared to just 3 million in 1964 — and the U.N. expects that number to triple by 2050, with perhaps over 100 million people living there by the end of the century. Fergus Walsh, correspondent for the BBC, reports on Zambia's population boom.

Coca-Cola is available nearly everywhere in the world, including many remote places in Africa, such as throughout the landlocked country of Zambia. What if medications for HIV and malaria were as cheap, widely available and heavily distributed as Coke? That's the thinking behind ColaLife, a project founded by Simon Berry, who has been an aid worker in Africa for years. Berry speaks with us about his organization.

A 13-year-old boy from a slum in Zambia is on his way to learning how to fly thanks to help from BBC radio listeners who heard his story. Freelance BBC reporter Jo Fidgen tells us about meeting the boy, Joseph Banda, and how she went along for the ride on his very first flight.