Lithuania’s President Dalia Grybauskaite and Germany’s President Frank-Walter Steinmeier attend a news conference during their visit to German troops in Rukla, Lithuania August 25, 2017.
Photo by Ints Kalnins

Kevin Mackenzie / UNIVERSITY OF ABERDEEN / SCIENCE PHOTO LIBRARY

A woman holds a sign that reads «I sing today for those voices that you have dared to shut up. We are not afraid» while observing a minute of silence at Placa de Catalunya, a day after a van crashed into pedestrians at Las Ramblas in Barcelona, Spain August 18, 2017.
Photo by Susana Vera

Chinese tourists are seen on a boat taking them from the Chinese side of the Yalu River for sightseeing close to the shores of North Korea, near Dandong, Liaoning province, China August 10, 2017.
Photo by Philip Wen

Athletics – World Athletics Championships – Women’s 100 Metres Hurdles Heats – London Stadium, London, Britain – August 11, 2017. Michelle Jenneke of Australia before the heat.
Photo by Dylan Martinez

Micrografía electrónica de barrido a color del ojo de una mosca.
Kevin Mackenzie / UNIVERSITY OF ABERDEEN / SCIENCE PHOTO LIBRARY