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UK researchers have built a small device that measures tiny fluctuations in gravity, and could be used to monitor volcanoes or search for oil.
Such gravimeters already exist but compared to this postage stamp-sized gadget, they are bulky and pricy.
The new design is based on the little accelerometers found in smartphones...
This is a big upgrade on our ability to work with gravity ... a simple and small and extremely sensitive instrument to measure gravity changes... there must be a thousand uses for that!