Lagos
Geoeye/science Photo Library
Lagos #1
Geoeye/science Photo Library
Sinkhole
Dr Juerg Alean/science Photo Library
Smallpox Vaccine Production
Cdc/science Photo Library
Smallpox Research #1
Cdc/science Photo Library
Smallpox Research #2
Cdc/science Photo Library
Ponta Da Piedade, Portugal
Bob Gibbons