Medicine & TechnologyA nurse (L) hands out a red ribbon to a woman, to mark World Aids Day, at the entrance of Emilio Ribas Hospital, in Sao Paulo December 1, 2014.
Cathey Park of Cambridge, Massachusetts shows her cast signed by U.S. President Barack Obama after he spoke about health insurance at Faneuil Hall in Boston October 30, 2013.
Beach goers look at a red ribbon sand sculpture created by Indian sand artist Sudarshan Patnaik to create awareness about AIDS on the eve of World AIDS Day on a beach in Puri in the eastern Indian state of Odisha November 30, 2014.
French President Francois Hollande listens to ArcelorMittal workers as he visits their union meeting room during a visit at the ArcelorMittal Steel Factory in Florange, western France, November 24, 2014.
A volunteer wearing a protective suit walks in a 'high risk' zone during an Ebola training session held by Germany's Red Cross in Wuerzburg October 21, 2014.
People are silhouetted as they pose with laptops in front of a screen projected with a Google logo, in this picture illustration taken in Zenica October 29, 2014.