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

Voices
A Russian hunter at the Medved bear-hunting lodge in Siberia
Save the tigerWildlife charities turn to those who kill animals to help save them
News
Davis says: 'My career has been about filling a niche - there were fewer short actors and fewer roles – but now I'm being offered all kinds of things'
PeopleWarwick Davis on Ricky Gervais, Harry Potter and his perfect role
News
i100
Sport
Frank Lampard will pass Billy Wright and equal Bobby Charton’s caps tally of 106 caps against
sportFormer Chelsea midfielder in Etihad stopgap before New York contract
Arts and Entertainment
The first film introduced Daniel Radcliffe to our screens, pictured here as he prepares to board the train to Hogwarts for the first time.
booksHow reading Harry Potter helps children grow up to be gay-friendly
Arts and Entertainment
A scene from Aladdin is performed at the Tony Awards in New York in June
theatreBrit producer Lythgoe makes kids' musical comedy a Los Angeles hit
Sport
Usain Bolt of Jamaica smiles and shakes hands with a competitor after Jamaica won their first heat in the men's 4x100m relay
sport
News
Chancellor George Osborne, along with the Prime Minister, have been 'complacently claiming the economy is now fixed', according to shadow Chancellor Ed Balls
i100... which is awkward, because he is their boss, after all
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Day In a Page

Burgundy, the River Rhone & Provence – MS Swiss Corona - seven nights from £999pp
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Istanbul Ephesus & Troy – six nights from £859pp
Mary Rose – two nights from £319pp
Save the Tiger: Meet the hunters tasked with protecting Russia's rare Amur tiger

Hunters protect Russia's rare Amur tiger

In an unusual move, wildlife charities have enlisted those who kill animals to help save them. Oliver Poole travels to Siberia to investigate
Transfers: How has your club fared in summer sales?

How has your club fared in summer sales?

Who have bagged the bargain buys and who have landed the giant turkeys
Warwick Davis: The British actor on Ricky Gervais, how the Harry Potter set became his office, and why he'd like to play a spy

'I'm a realist; I know how hard this business is'

Warwick Davis on Ricky Gervais, Harry Potter and his perfect role
The best swim shorts for men: Bag yourself the perfect pair and make a splash this summer

The best swim shorts for men

Bag yourself the perfect pair and make a splash this summer
Has Ukip’s Glastonbury branch really been possessed by the devil?

Has Ukip’s Glastonbury branch really been possessed by the devil?

Meet the couple blamed for bringing Lucifer into local politics
Dress the Gaza situation up all you like, but the truth hurts

Robert Fisk on Gaza conflict

Dress the situation up all you like, but the truth hurts
Save the tiger: Tiger, tiger burning less brightly as numbers plummet

Tiger, tiger burning less brightly

When William Blake wrote his famous poem there were probably more than 100,000 tigers in the wild. These days they probably number around 3,200
5 News's Andy Bell retraces his grandfather's steps on the First World War battlefields

In grandfather's footsteps

5 News's political editor Andy Bell only knows his grandfather from the compelling diary he kept during WWI. But when he returned to the killing fields where Edwin Vaughan suffered so much, his ancestor came to life
Lifestyle guru Martha Stewart reveals she has flying robot ... to take photos of her farm

Martha Stewart has flying robot

The lifestyle guru used the drone to get a bird's eye view her 153-acre farm in Bedford, New York
Former Labour minister Meg Hillier has demanded 'pootling lanes' for women cyclists

Do women cyclists need 'pootling lanes'?

Simon Usborne (who's more of a hurtler) explains why winning the space race is key to happy riding
A tale of two presidents: George W Bush downs his paintbrush to pen father’s life story

A tale of two presidents

George W Bush downs his paintbrush to pen father’s life story
Restaurateur Mitch Tonks has given the Great Western Pullman dining car a makeover

The dining car makes a comeback

Restaurateur Mitch Tonks has given the Great Western Pullman dining car a makeover
Gallery rage: How are institutions tackling the discomfort of overcrowding this summer?

Gallery rage

How are institutions tackling the discomfort of overcrowding this summer?
Louis van Gaal has £500,000 video surveillance system installed to monitor Manchester United players

Eye on the prize

Louis van Gaal has £500,000 video surveillance system installed to monitor Manchester United players
Women's rugby: Tamara Taylor adds fuel to the ire in quest to land World Cup

Women's rugby

Tamara Taylor adds fuel to the ire in quest to land World Cup