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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

Criminal Investigation Underway After Family Says Christian Grandmother Euthanized Without Consent

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'

Why Canadians are ready for closer ties with Europe