Ms Nash, who is a wheelchair user, is also claiming the authority failed to carry out a proper impact assessment under the Equality Act.

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While any unexplained death is worthy of attention, there is a real risk of high-profile publicity driving MS patients away from a convenient, user-friendly treatment that can help them forestall a disabling disease.

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Ms. Knight recently conducted a series of user studies at Carnegie Mellon casting Data as a campus tour guide.

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"These vendors expanded their market reach and kept on improving the user experience of their Android devices, " said Ms. Cozza.

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Ms Mayer said Yahoo would now work with Tumblr to create ads that "are seamless and enhance the user experience".

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