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At the same time, the fire will produce gases that can mix with air and sink to the bottom of the valley. "A tiny spark is enough to ignite the highly flammable gas mixture, creating an eruption of flames that can engulf the entire valley within minutes," Liu said.

At the Wednesday press conference, Tedros credited the United Kingdom for its scientific breakthrough with a drug trial, saying the WHO welcomed the positive initial results from the trial of dexamethasone, a common steroid. He said the steroid has been shown to have a beneficial effect on those patients severely ill with COVID-19.

At the sight of a stranger, the dogs will gather around, barking but not particularly threatening. Their eyes betray their fear and melancholia.

At this time, the supply of vegetables online is five times higher than the previous level on average, as orders from consumers who have to cook at home due to the coronavirus outbreak continued to rise.

At the Friday conference, Maria Van Kerkhove, technical lead of the WHO Health Emergencies Programme, said it is "very very welcome news" to hear that there are no more severe cases and no more patients of COVID-19 in Wuhan.