In a statement, Nasa said the problem had been detected on Tuesday, when the telescope went into a pre-programmed "safe mode" which kicks in "if the observatory has trouble knowing where it should point", Mr Grunsfeld told AFP news agency.

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His company, Verified Identity Pass , a screening service that's created an express lane at airport security posts for pre-screened passengers deemed safe by the government, has effectively been cleared to take off past its initial successful test run in Orlando, Fla.

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In another trial called PrEP -- pre-exposure prophylaxis -- the CDC is also studying whether antiretroviral pills are safe and effective in preventing HIV infection.

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It is hard to argue that anything above the Holocene maximum (of about 0.5 degrees above the pre-industrial temperature) can preserve a safe climate, and that we have already gone too far.

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Recently, Cepheid got 510(k) clearance from the U.S. Food and Drug Administration (a pre-marketing submission to demonstrate that the device to be marketed is safe and effective) for GeneXpert to work on Group B Streptococcus.

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Campaigns will be executed via pre-roll ad units across AOL On's premium, brand-safe content.

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It has got around the state monopoly on advertising by deploying its trademark blimps, and pre-empted objections to that by using them to advocate a worthy cause: safe driving.

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