Voices Ice forms on the shore of the East River due to unusually low temperatures caused by a polar vortex in New York

All 50 US states are below freezing as the polar vortex sworls around North America, shattering temperature records and causing a collective shudder across the continent.

Pregnancy: are test accurate?

How accurate are home pregnancy tests? Is it possible to be pregnant even though the test is negative on the day my period is due? And is it possible that a positive pregnancy test could be wrong?

Fill your tank with the fuels from Formula 1

Formula One cars are subject to even more scrutiny than Olympic athletes. And the results are supposed to help us, says Timandra Harkness

Letter: Leukaemia children

Sir: The Leukaemia Research Fund has been greatly saddened to learn of the death of Georgina Horlick. Despite all the pressures on her time, Georgina's mother, Nicola, has given selfless and invaluable support to the fundraising efforts of the Leukaemia Research Fund.

Brothers wait on leukaemia test

Brothers wait on leukaemia test

Letter: A pest to whom exactly?

GEOFFREY LEAN calls the badger "a positive menace" ("Watch out, Mr Badger", 23 August). But it is not a pest species. It is not in competition with agriculture. And the theory concerning a connection with TB is thrown into increasing doubt by results of the culling programme. The presence of the badger indicates that we have not yet crossed the Rubicon, that there is still British countryside outside of the scientised, sanitised, production process. Anyone who sees a badger in the wild can feel only honoured; many older country people have never seen one. Established sets often have a history in an area not of decades but of centuries. These creatures have a right to remain unmolested.

Ailing Jordan carries Bulls

Basketball

Little relief in lift convictions

Little relief in lift convictions

SIGNIFICANT SHORTS : SIGNIFICANT SHORTS : HIV virus bite transmit

The first documented case of the HIV virus being transmitted by a human bite is reported today in the Lancet. It involved a Slovenian man who was accidentally bitten by a neighbour who had Aids. The man went to help the Aids patient, who was having a fit, and to help him breathe, stuck his fingers in his neighbour's mouth.

Test failures

Tests on Dancing Dove, second to Chadwick's Ginger at Carlisle on 6 October, and High Five, tailed-off behind Unchanged at Folkestone on 7 September, have proved positive to prohibited substances.
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Scottish referendum: The Yes vote was the love that dared speak its name, but it was not to be

Despite the result, this is the end of the status quo

Boyd Tonkin on the fall-out from the Scottish referendum
Manolo Blahnik: The high priest of heels talks flats, Englishness, and why he loves Mary Beard

Manolo Blahnik: Flats, Englishness, and Mary Beard

The shoe designer who has been dubbed 'the patron saint of the stiletto'
The Beatles biographer reveals exclusive original manuscripts of some of the best pop songs ever written

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Behind The Beatles' lyrics - thanks to Hunter Davis's original manuscript copies
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'Normcore': Blending in is the new standing out

Just when fashion was in grave danger of running out of trends, it only went and invented the non-trend. Rebecca Gonsalves investigates
Dance’s new leading ladies fight back: How female vocalists are now writing their own hits

New leading ladies of dance fight back

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New biography sheds light on comic genius of Douglas Adams
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Shows like Agents of S.H.I.E.L.D are little more than marketing tools
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From pools to football pitches, rooftop living is looking up
These are the 12 best hotel spas in the UK

12 best hotel spas in the UK

Some hotels go all out on facilities; others stand out for the sheer quality of treatments
These Iranian-controlled Shia militias used to specialise in killing American soldiers. Now they are fighting Isis, backed up by US airstrikes

Widespread fear of Isis is producing strange bedfellows

Iranian-controlled Shia militias that used to kill American soldiers are now fighting Isis, helped by US airstrikes
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Topshop goes part Athena poster, part last spring Prada

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How to make a Lego masterpiece

Toy breaks out of the nursery and heads for the gallery
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Meet the ‘Endies’ – city dwellers who are too poor to have fun

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Ian Paisley’s decision to make peace with his IRA enemies

His Save Ulster from Sodomy campaign would surely have been supported by many a Sunni imam