It has what is known as a long tail - it takes several years for claims to materialise on policies taken out several years previously.

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It already has a 64, 000km-long tail of dust and gas that will become visible to the naked eye later in the year - a trail scientists will study closely.

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It, in fact, has a very fat tail, and in 2008, that portfolio would have lost 37%, where a risk-parity portfolio would have lost less than half that amount at the same targeted level of volatility.

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The citral molecule has a double bond in its tail, which, when it comes into contact with acid, forms a circular structure.

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It turns out that the long-tail theory, while true, has a nonintuitive corollary: Aggregators are the ones who benefit most from all that choice.

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This puts it on the tail of Sikorsky's experimental X2, which has set an unofficial world record for a helicopter by flying at just over 460kph.

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Each segment has an electromagnet attached to it, and these are activated by a current that flows from head to tail in more or less the way that a nerve signal flows in a real animal.

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"We had always expected a gap-filler with typically intermediate features such as a moderately elongate tail -- neither long nor short -- but the strange thing about Darwinopterus is that it has a head and neck just like that of advanced pterosaurs, while the rest of the skeleton, including a very long tail, is identical to that of primitive forms, " he said.

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