View image in fullscreenKajpaz, Afghanistan Afghan children journey to receive polio drops as part of a nationwide vaccination drivePhotograph: Sanaullah Seiam/AFP/Getty ImagesShareView image in fullscreenLondon, UK Stack by Nicole Eisenman, a monumental, 8-metre-tall totem sculpture has been installed in the Annenberg Courtyard at the Royal Academy of ArtsPhotograph: Amer Ghazzal/ShutterstockShareView image in fullscreenSolok, IndonesiaA village hit by flash floods on Tuesday caused by heavy rainsPhotograph: Wawan Kurniawan/ReutersShareView image in fullscreenAlaska, USA bear taking a stroll in the Katmai national park