For months, the BBC has been communicating in secret with three North Koreans living in the country. They expose, for the first time, the disaster unfolding there since the government sealed the borders more than three years ago.

One of the world's most common artificial sweeteners is set to be declared a possible carcinogen next month by a leading global health body, according to two sources with knowledge of the process, pitting it against the food industry and regulators.

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