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But Martinon-Torres found it was the pit soil that functioned as a natural preservative due to its suitable pH-value, small amounts of organic matter and fine granular structure.

But how to make self-driving trains handle any emergencies－for example, obstructions on the tracks－remains the most important problem yet to be solved, he said.

But far worse impacts will hit without urgent action to cut fossil fuel emissions, including an eventual sea level rise of about 4 meters in the worst case, an outcome that would redraw the map of the world and harm billions of people.

But Schwanen of Oxford University doubts that such low prices will be achievable early on, even in today's business environment replete with money-losing companies that value growth over profit.

But for Wang Wei, a veteran researcher at the Chinese Academy of Social Sciences' Institute of Archaeology, the Temple of Montu, built in the 14th century BC, is a place full of hope.