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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John Palmer: 'Goldfinger' of British crime was murdered, say police

Murder of the Brink’s-MAT mastermind

'Goldfinger' of British crime's life ended in a blaze of bullets, say police
Forget little green men - aliens will look like humans, says Cambridge University evolution expert

Forget little green men

Leading evolutionary biologist says aliens will look like humans
The Real Stories of Migrant Britain: An Algerian scientist adjusts to life working in a kebab shop

The Real Stories of Migrant Britain

An Algerian scientist struggles to adjust to her new life working in a Scottish kebab shop
Bodyworlds museum: Dr Gunther von Hagens has battled legal threats, Parkinson's disease, and the threat of bankruptcy

Dying dream of Doctor Death

Dr Gunther von Hagens has battled legal threats, Parkinson's disease, and the threat of bankruptcy
UK heatwave: Temperature reaches 39.8 degrees on Central Line - the sweatiest place in London

39.8 degrees recorded on Tube

There's hot (London) and too damn hot (the Underground). Simon Usborne braved the Central line to discover what its passengers suffer
Kitchens go hi-tech: From robot chefs to recipe-shopping apps, computerised cooking is coming

Computerised cooking is coming

From apps that automatically make shopping lists from your recipe books to smart ovens and robot chefs, Kevin Maney rounds up innovations to make your mouth water
Jessie Cave interview: The Harry Potter star has published a feminist collection of cartoons

Jessie Cave's feminist cartoons

The Harry Potter star tells Alice Jones how a one-night stand changed her life
Football Beyond Borders: Even the most distruptive pupils score at homework club

Education: Football Beyond Borders

Add football to an after-school homework club, and even the naughtiest boys can score
10 best barbecue books

Fire up the barbie: 10 best barbecue books

We've got Bibles to get you grilling and smoking like a true south American pro
Wimbledon 2015: Nick Bollettieri - Junk balls and chop and slice are only way 5ft 1in Kurumi Nara can live with Petra Kvitova’s power

Nick Bollettieri's Wimbledon Files

Junk balls and chop and slice are only way 5ft 1in Kurumi Nara can live with Petra Kvitova’s power
Ron Dennis exclusive: ‘This is one of the best McLaren teams ever – we are going to do it’

‘This is one of the best McLaren teams ever – we are going to do it’

Ron Dennis shrugs off a poor start to the season in an exclusive interview, and says the glory days will come back
Seifeddine Rezgui: What motivated a shy student to kill 38 holidaymakers in Tunisia?

Making of a killer

What motivated a shy student to kill 38 holidaymakers in Tunisia?
UK Heatwave: Temperatures on the tube are going to exceed the legal limit for transporting cattle

Just when you thought your commute couldn't get any worse...

Heatwave will see temperatures on the Tube exceed legal limit for transporting cattle
Exclusive - The Real Stories of Migrant Britain: Swapping Bucharest for London

The Real Stories of Migrant Britain

Meet the man who swapped Romania for the UK in a bid to provide for his family, only to discover that the home he left behind wasn't quite what it seemed
Cheaper energy on the way, but it's not all sunshine and rainbows

Cheaper energy on the way, but it's not all sunshine and rainbows

Solar power will help bring down electricity prices over the next five years, according to a new report. But it’s cheap imports of ‘dirty power’ that will lower them the most