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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Pompeii, Capri & the Bay of Naples
Seven Cities of Italy
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Lake Garda
Minoan Crete and Santorini
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Revealed: Why Mohammed Emwazi chose the 'safe option' of fighting for Isis, rather than following his friends to al-Shabaab in Somalia

Why Mohammed Emwazi chose Isis

His friends were betrayed and killed by al-Shabaab
'The solution can never be to impassively watch on while desperate people drown'
An open letter to David Cameron: Building fortress Europe has had deadly results

Open letter to David Cameron

Building the walls of fortress Europe has had deadly results
Tory candidates' tweets not as 'spontaneous' as they seem - you don't say!

You don't say!

Tory candidates' election tweets not as 'spontaneous' as they appear
Mubi: Netflix for people who want to stop just watching trash

So what is Mubi?

Netflix for people who want to stop just watching trash all the time
The impossible job: how to follow Kevin Spacey?

The hardest job in theatre?

How to follow Kevin Spacey
Armenian genocide: To continue to deny the truth of this mass human cruelty is close to a criminal lie

Armenian genocide and the 'good Turks'

To continue to deny the truth of this mass human cruelty is close to a criminal lie
Lou Reed: The truth about the singer's upbringing beyond the biographers' and memoirists' myths

'Lou needed care, but what he got was ECT'

The truth about the singer's upbringing beyond
Migrant boat disaster: This human tragedy has been brewing for four years and EU states can't say they were not warned

This human tragedy has been brewing for years

EU states can't say they were not warned
Women's sportswear: From tackling a marathon to a jog in the park, the right kit can help

Women's sportswear

From tackling a marathon to a jog in the park, the right kit can help
Hillary Clinton's outfits will be as important as her policies in her presidential bid

Clinton's clothes

Like it or not, her outfits will be as important as her policies
NHS struggling to monitor the safety and efficacy of its services outsourced to private providers

Who's monitoring the outsourced NHS services?

A report finds that private firms are not being properly assessed for their quality of care
Zac Goldsmith: 'I'll trigger a by-election over Heathrow'

Zac Goldsmith: 'I'll trigger a by-election over Heathrow'

The Tory MP said he did not want to stand again unless his party's manifesto ruled out a third runway. But he's doing so. Watch this space
How do Greek voters feel about Syriza's backtracking on its anti-austerity pledge?

How do Greeks feel about Syriza?

Five voters from different backgrounds tell us what they expect from Syriza's charismatic leader Alexis Tsipras
From Iraq to Libya and Syria: The wars that come back to haunt us

The wars that come back to haunt us

David Cameron should not escape blame for his role in conflicts that are still raging, argues Patrick Cockburn
Sam Baker and Lauren Laverne: Too busy to surf? Head to The Pool

Too busy to surf? Head to The Pool

A new website is trying to declutter the internet to help busy women. Holly Williams meets the founders