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US president and his Republican challenger spend final days of campaign in swing states with critical electoral votes.
Gil Weiss, 29, and Ben Horne, 32, fell an estimated 300 metres off a ridge after ascending 6,100-metre Peruvian peak.
Geomagnetic storm ends up weaker than predicted with minor communications problems experienced in polar regions.
Climate change induced extreme weather events and shifting weather patterns are challenging farmer's ability to feed us.
Ocean could be ice-free in summers within 40 years and sea levels could rise by 1.6 metres by 2100, says new study.
Featured on Al Jazeera
An interactive dashboard examines the history, successes and challenges facing the group as leaders meet in Addis Ababa.
Series on the Palestinian 'catastrophe' of 1948 that led to dispossession and conflict that still endures.
Fallout from rare strike at Arabtec Construction continues, as many South Asian labourers ordered to leave the country.
A four-part series that gives a rare insight into the country on the move, with history in tow.
Featured
Two years since the start of the uprising, rebels and Assad's forces remain locked in conflict.
A four-part series that gives a rare insight into the country on the move, with history in tow.
News and analysis of 2013 presidential contest as Ahmadinejad finishes second term.
Extensive coverage of war crimes tribunals and controversial calls for blasphemy laws.
Series on the Palestinian 'catastrophe' of 1948 that led to dispossession and conflict that still endures.
In Pictures
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