This allows the phone to determine the location and movement on the surface, even for multi-point touch.

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Drop a second device on Surface and the system will offer up point-by-point comparisons of the two phones.

FORBES: Surface Surfaces At AT&T

"From our point of view, if the surface of Europa is subliming - if it is being sculpted by the sunlight - it will form these features, " Dr Hobley told BBC News.

BBC: Ice blades threaten Europa landing

This is a special type of Earth model which traces its idealised "horizontal" surface - the plane on which, at any point, the pull of gravity is perpendicular to it.

BBC: Europe's Goce satellite probes Earth's gravity

By late afternoon, I'd fine-tuned my falling-off-a-building sailboard technique to the point where I was bumping along the surface of the lake for minutes at a stretch.

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The tungsten dust contemplated here would be about 30 micro-meters in diameter, and be released at a point 1100 km above the surface of the Earth.

FORBES: Solving the Space Junk Problem -- With More Space Junk?

Because of where Droitwich sits - we're the lowest point of the Salwarpe Valley - we're low enough for the saltwater to spring to the surface.

BBC: Hereford & Worcester

At that point the fluid-dynamics equivalent of a titanic arm-wrestling match will get under way, with the surface vessels' pumps trying to push the mud down the well while the rising oil tries to push it out.

ECONOMIST: The Gulf oil spill