This is the theory that life is not merely a surface scum which clings to the outside of planet Earth, but that living things, in the form of so-called extremophile bacteria which can tolerate infernal heat, penetrate several kilometres into the planet's interior.

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The authors suggest that a rapidly evolving technical to manage hydrates is to heat the pipes that carry the hydrocarbons to the surface, either through electric heaters or by circulating hot water around the outside of the pipe.

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Indeed, being focused on odors -- which themselves require air to move, or a surface to light on -- means that for my dogs, the street outside our apartment building is different each time we step out the door.

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It is expected to reveal the less salubrious parts of Roman London outside of the City walls with archaeologists anticipating to encounter Roman timber-framed buildings and a street surface 6m below ground level.

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