Primary school pupils need to have at least nine hours’ sleep each night or their capacity to learn will be impaired, say researchers.

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Pupils ‘need nine hours of sleep’

Primary school pupils need to have at least nine hours’ sleep each night or their capacity to learn will be impaired, say researchers.

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Pupils ‘need nine hours of sleep’

At least nine people are killed and 45 others injured in an explosion outside the high court in the Indian capital, Delhi.

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Blast at Delhi court kills nine

A series of at least nine mistakes in this year’s GCSE and A-level exam papers is “not an acceptable situation”, Prime Minister David Cameron has said.

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Exam errors not acceptable – PM

A series of at least nine mistakes in this year’s GCSE and A-level exam papers is “not an acceptable situation”, Prime Minister David Cameron has said.

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Exam errors not acceptable – PM

A series of storms struck Oklahoma, Kansas and Arkansas late Tuesday and early Wednesday, wiping out homes and businesses and killing at least nine people.

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Storms Hit 3 States and at Least 9 People Are Killed

An extra hour of sleep is all they needed? The Federal Aviation Administration announced a new schedule that gives air traffic controllers at least nine hours off between shifts, compared with eight now. It also bans controllers form swapping shifts to…

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FAA: More Rest for Controllers

At least nine people have been killed across the southern United States in storms that saw heavy down pours and strong winds.

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VIDEO: Severe storms hit southern US

A bomb attack on a mosque in north-western Pakistan has killed at least nine people, police say.

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Pakistan mosque bomb ‘kills nine’

A man wielding a knife wounds at least nine people at random in a rampage on the Spanish holiday island of Ibiza.

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Nine hurt in Ibiza knife rampage

At least nine people are killed in a bomb attack near a police station in north-western Pakistan, police say.

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Nine killed in Peshawar explosion

Officials urged thousands of people in Brisbane to flee on Tuesday as floodwaters that killed at least nine people rushed toward the coastal capital of 2 million people.

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Australia’s Third-Largest City at Risk From Floods

At least nine Senate Republicans now plan to vote for the new arms control treaty with Russia, giving it enough support for Senate approval, according to a CNN estimate.

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CNN estimate: START will pass

At least nine Mexican police officers have been shot and killed in an ambush and six youths shot dead in Mexico City, in what police say may have been a gang-related feud.

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Mexico caught in bloody anti-drugs war

At least nine Mexican police officers are shot and killed in an ambush – the sixth multiple killing in Mexico in less than a week.

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Twenty die in Mexican shootings