However, until the ecological studies are completed, scientists will still be very much in the dark about the origins of this mysterious illness.

BBC: Africa's emerging virus threat

The explanation for this may lie in the enigmatic "dark energy" that scientists know so little about but which is said to be accelerating the expansion of the Universe.

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But shareholder decisions must be based on the facts, and too often investors are kept in the dark about the pay of senior executives.

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It was supposed to be about a two-minute walk, but in the unfamiliar dark I missed my house and continued on past more stilt houses.

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There will be much talk about how the eurozone crisis can be solved, what the next step should be in the US where a debt ceiling still casts a dark shadow over optimism, and about how income inequality has become a problem for all - rather than merely an advantage for haves over have-nots.

BBC: Davos 2013: 'Dynamic resilience' in a volatile world

About 650, 000 New Yorkers are still without power, and many will continue to be in the dark for more than another week.

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