October 22, 2014 -- Updated 0931 GMT (1731 HKT) Edited by Susannah Cullinane in London

A former NATO commander says the alliance should help Sweden search for an underwater vessel -- possibly a Russian submarine -- that may have penetrated its territorial waters. FULL STORY

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Satellite views of the key Syrian border city besieged by ISIS.
CONSUMER NEUROTECHNOLOGY
A portable headset offers three settings: Energy, relaxation, focus.
ART OF DISSENT
Through his art, Ai declares: "Every one of us is a potential convict."
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