Archaeologists in London have found 13 skeletons that date back 700 years. Historians say as many as 50,000 people died around the year 1348. Name the phenomenon that spread across Europe and re-shaped the human landscape of London.
Philip Graitcer used to work in Africa as an epidemiologist for the CDC. Recently he returned to Africa as a journalist and met people living with elephantiasis. He shares his thoughts on the patients who remain even when a disease is gone.
Several scientific groups are tracking the global spread of infectious diseases by monitoring Twitter, web searches, and other content online. The World's Rhitu Chatterjee looks at the promise and challenges of disease surveillance via the internet.