View image in fullscreenTanah Datar, IndonesiaA farmer works in a paddy field as the Mount Marapi volcano spews volcanic ashPhotograph: Atet Dwi Pramadia/ReutersShareView image in fullscreenAlxa, ChinaTaikonaut Zhang Lu, commander of the three-member Shenzhou 21 crew, is helped out of the return capsule at the Dongfeng landing site after a historic 210-day orbital stayPhotograph: VCG/Getty ImagesShareView image in fullscreenBunia, Democratic Republic of the CongoHealth workers stand in a new Ebola treatment centre during a visit from Tedros Adhanom Ghebreyesus, director