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Why did an OpenAI system hack Australia's health system - and can it be stopped in the future?

Watch: The arms race in space explained

Poland accuses Russian military helicopter of violating its airspace

Top South African policeman charged with sexual offences

Autopsy shows Hayden Panettiere died from a drug overdose

Watch: What to expect from the UN General Assembly

Our head teacher was an abuser. We joined forces to get justice - now we're married

Sister of Pakistan's ex-PM Imran Khan arrested

Millions without power as Cuba hit by latest major blackout

Warren Buffett steps down after six decades at Berkshire - 'Father Time always wins'

Assad regime planned US journalist's kidnap for weeks, BBC finds

Why Canadians are ready for closer ties with Europe