News A pedestrian makes their way along a snow packed street in Indianapolis

Much of the United States is currently in the grip of a polar vortex, a system of dense air producing plummeting temperatures and swathes of freezing weather, bringing some parts of the country to a halt and causing chaos in others.

Canada vows to defend Santa Claus from Russian troops as row over territory escalates

Vladimir Putin told a defence ministry meeting that he wished to see the military bolster its presence in the territory

Olympic Sochi 2014 Winter Games torch makes history in first spacewalk

Flight engineers Oleg Kotov and Sergey Ryazanskiy left their base at the International Space Station today carrying the torch

2014 Sochi Olympic torch relay blasts off to space for historic walk

Unlit torch will tour International Space Station before being taken on its first ever trip outside the base

Greenpeace activists hold a banner in front of the Gazprom office in Paris

‘Only drug on Greenpeace ship was medical morphine’: Wives of two men held in Russia claim innocent husbands are being kept in inhumane conditions

The men’s relatives describe the conditions in the prison as worse than the North Pole

Hill and Dale: The lofty view from Errington

Tales from the Trees: Errington Wood, North Yorks - Take to the high ground for a look back over the millennia

Even before you've consulted the car park signs, you just know this hump-backed wood heaves with history. There's something about its location that speaks of ancient concerns: positioning, clear lines of vision, the importance of higher ground. Then, as my wife dons a pack and I lift my son on to my shoulders, we pass information boards that confirm it. Stone Age man quarried here; by the Bronze Age, it had been re-imagined as a resting spot for chieftains. One look around and you understand why.

Ben Saunders, explorer
Parker Liautaud outside the Antarctic chamber, where the temperature is -25C

-25C on the Thames? Young explorer Parker Liautaud lives in pop-up South Pole to prepare for trip

The explorer and climate change campaigner Parker Liautaud puts most other 19-year-olds to shame.

InRealLife gives a perverse account of how digital technologies are changing the lives of teenagers

Establishment figures still fail to portray the Internet in a balanced light

Increasingly unusual weather patterns in recent years have led climate scientists and meteorologists to hold a meeting about concerns over climate change

Stand by for another DECADE of wet summers, say Met Office meteorologists

Climate change may be intensifying the natural cycle and may prolong it, says expert, but it is too early to say

Sterling's silver lining

The chances of incoming Bank of England Governor Mark Carney finding a triple-dip recession in his in-tray this summer could fall on Tuesday as manufacturers attempt to bounce back from a January slump.

Arctic ice-melt will bring frosty relations as nations navigate across North Pole

The loss if sea ice in the Arctic will allow ships to navigate freely across the North Pole by the middle of the century and could lead to unprecedented geo-political tensions between countries that have territorial claims in the region, scientists said.

Builders lighten UK economic gloom

The UK's post-Olympic hangover is likely to be less painful than first feared this week, as the latest figures on the economy's performance at the end of 2012 gives some respite for the Chancellor.

Editorial: We must not talk ourselves into a 'triple dip'

Yesterday's keenly awaited GDP figures allowed the doom-mongers to forecast that the UK was headed for a "triple-dip" recession, if we were not in one already. The Chancellor, at the World Economic Forum in Davos, professed himself disappointed with the news, even as he vowed to press on with Plan A.

MPs attack Government 'hypocrisy' over refusal to ban Arctic drilling

An influential cross-party committee of MPs accused the Government of environmental hypocrisy for refusing to push for a moratorium on drilling for oil and gas in the Arctic.

A cosmic collision: Two satellites due to smash into surface of the moon… but don't worry, it was all planned by Nasa

NASA has deliberately guided the twin satellites into a cliff close to the moon’s northern pole

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War with Isis: Iraq declares victory in the battle for Tikrit - but militants make make ominous advances in neighbouring Syria's capital

War with Isis

Iraq declares victory in the battle for Tikrit - but militants make make ominous advances in neighbouring Syria
Scientists develop mechanical spring-loaded leg brace to improve walking

A spring in your step?

Scientists develop mechanical leg brace to help take a load off
Peter Ackroyd on Alfred Hitchcock: How London shaped the director's art and obsessions

Peter Ackroyd on Alfred Hitchcock

Ackroyd has devoted his literary career to chronicling the capital and its characters. He tells John Walsh why he chose the master of suspense as his latest subject
Ryan Reynolds interview: The actor is branching out with Nazi art-theft drama Woman in Gold

Ryan Reynolds branches out in Woman in Gold

For every box-office smash in Ryan Reynolds' Hollywood career, there's always been a misconceived let-down. It's time for a rethink and a reboot, the actor tells James Mottram
Why Robin Williams safeguarded himself against a morbid trend in advertising

Stars safeguard against morbid advertising

As film-makers and advertisers make increasing posthumous use of celebrities' images, some stars are finding new ways of ensuring that they rest in peace
The UK horticulture industry is facing a skills crisis - but Great Dixter aims to change all that

UK horticulture industry facing skills crisis

Great Dixter manor house in East Sussex is encouraging people to work in the industry by offering three scholarships a year to students, as well as generous placements
Hack Circus aims to turn the rule-abiding approach of TED talks on its head

Hack Circus: Technology, art and learning

Hack Circus aims to turn the rule-abiding approach of TED talks on its head. Rhodri Marsden meets mistress of ceremonies Leila Johnston
Sevenoaks is split over much-delayed decision on controversial grammar school annexe

Sevenoaks split over grammar school annexe

If Weald of Kent Grammar School is given the go-ahead for an annexe in leafy Sevenoaks, it will be the first selective state school to open in 50 years
10 best compact cameras

A look through the lens: 10 best compact cameras

If your smartphone won’t quite cut it, it’s time to invest in a new portable gadget
Paul Scholes column: Ross Barkley played well against Italy but he must build on that. His time to step up and seize that England No 10 shirt is now

Paul Scholes column

Ross Barkley played well against Italy but he must build on that. His time to step up and seize that England No 10 shirt is now
Why Michael Carrick is still proving an enigma for England

Why Carrick is still proving an enigma for England

Manchester United's talented midfielder has played international football for almost 14 years yet, frustratingly, has won only 32 caps, says Sam Wallace
Tracey Neville: The netball coach who is just as busy as her brothers, Gary and Phil

Tracey Neville is just as busy as her brothers, Gary and Phil

The former player on how she is finding time to coach both Manchester Thunder in the Superleague and England in this year's World Cup
General Election 2015: The masterminds behind the scenes

The masterminds behind the election

How do you get your party leader to embrace a message and then stick to it? By employing these people
Machine Gun America: The amusement park where teenagers go to shoot a huge range of automatic weapons

Machine Gun America

The amusement park where teenagers go to shoot a huge range of automatic weapons
The ethics of pet food: Why are we are so selective in how we show animals our love?

The ethics of pet food

Why are we are so selective in how we show animals our love?