24 hours in pictures

Serjilla, Syria: A shepherd cares for his flock near the ruins of the so-called 'Dead City' of Serjilla, south-west of Aleppo. The settlements were abandoned more than 1,000 years ago. Photograph: Bulent Kilic/AFP/Getty Images

Barcelona, Spain: A worker watches as activists of the Mortgage Victims Platform occupy a bank during a protest to support neighbours who are facing eviction. Photograph: Emilio Morenatti/AP

Hamburg, Germany: A duck walks through snow after heavy snowfall. Photograph: Sven Hoppe/AFP/Getty Images

Aurora, Colorado: Girls demonstrate how to use bulletproof backpacks as shields. Photograph: Rick Wilking/Reuters

Coronel, Chile: People walk past thousands of washed-up shrimps, which were killed after water used to cool two thermal power stations was discharged into the sea.
Photograph: José Luis Saavedra/Reuters

Saint-Denis, France: A premature newborn baby lies in a cot in the neonatal ward of the Delafontaine hospital.
Photograph: Joël Saget/AFP/Getty Images

M'hamid El Ghizlane, Morocco: Nomads vie for the ball during a match of nomad hockey, played on sand. Photograph: Fadel Senna/AFP/Getty Images

Beijing, China: A boy plays at the Imperial Ancestral Temple following overnight snowfall. Photograph: Feng Li/Getty Images

Hangzhou, China: A piece of graphene aerogel developed at Zhejiang University is placed on a cherry flower. The sponge-like matter weighs 0.16 milligrams per cubic centimetre and is the world's lightest solid material. Photograph: Long Wei/EPA

Tel Aviv, Israel: Members of the Israeli military wait before an official welcoming ceremony for the US president, Barack Obama, at Ben Gurion airport. Photograph: Uriel Sinai/Getty Images

Havana, Cuba: Early morning in the old quarter of the capital. Photograph: Enrique De La Osa/Reuters

Valencia, Spain: Firefighters put out a blaze during the last day of the Las Fallas festival, which celebrates the arrival of spring with fireworks, fiestas and bonfires made out of large puppets called ninots. Photograph: David Ramos/Getty Images

New Delhi, India: Men of the northern Indian Jat community, who are mainly farmers and herders, listen to a speaker at a protest near parliament to demand that their community be made eligible for affirmative action for government jobs and entry into educational institutions. Photograph: Altaf Qadri/AP