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.

Wanted: new chief of staff to run the White House – and get on with Obama

On the cusp of what promises to be a tough re-election year, Barack Obama yesterday confirmed his most senior aide, White House Chief of Staff Bill Daley, is stepping down early after a relatively brief, but often scratchy, 12 month in the post.

Gil Scott-Heron performs in California in 2010

Godfather of rap's last words: Exclusive extract from Gil Scott-Heron’s posthumous memoir

Next month, the visionary poet, rap/hip-hop pioneer, and author Gil Scott-Heron will be honoured with a Special Merit Award at the Grammys. Here is an exclusive extract from his forthcoming memoir, The Last Holiday

'This stuff is marvellous': Chamberlain in his Shelter Island studio last year

John Chamberlain: Sculptor who gave new life to scrap-heap cars

John Chamberlain was a sculptor who experimented with many techniques and materials over his half-century career as an artist. But his signature pieces remain the numerous sculptures made of metal from old cars. With titles such as Glove-Box Collision, Spark Plug Staccato and Fly Wheel Sonata, these colourful and imposing works give a new and enduring life to material from vehicles which have been consigned to the scrap-heap.

Richard Wolffe: Mitt Romney's underwhelming performance does not fully explain Iowa's extraordinary three-way split

You can't blame Mitt Romney. It may be easy to be beastly to the unloved Republican presidential frontrunner. He may well look like "the guy who laid you off," as one former conservative rival quipped. He may well have spent the last four years and as many millions (with the help of anonymous supporters) going nowhere in Iowa: he gained almost exactly the same number of votes yesterday as he did in 2008.

The Obama campaign has not officially begun, but the re-election headquarters in Chicago is buzzing, with 200 workers on board

Inside Obama's Chicago machine

As the Republican primaries get under way, David Usborne is granted exclusive access to the crack team in the President's home town who hope to neutralise the enemy and return their man to the White House

Supertall: the Shanghai World Financial Centre, the world's fourth tallest building at 492m

Skyscrapers: Inside the power of the tower

A meeting of wealth and innovation – the skyscraper is the defining symbol of our age. A new book dissects the workings of our megatowers. Will Dean meets its author

Rappers' snaps hit bum note

An American attempt to smooth relations with Pakistan using hip-hop diplomacy unravelled yesterday when the Pakistani military briefly detained a music group accused of taking photographs of sensitive installations.

Wilco, Roundhouse, London

The masters of reinvention are still inspiring a whole lot of love

Album: Sharon Jones & the Dap-Kings, Soul Time! (Daptone)

Soul Time! is a near-perfect expression of retro-soul style that grips from its opening bars.

'Too thin to conceive' women warned

Being too thin can be just as damaging as being too fat when it comes to getting pregnant, according to new research.

Album: Tom Waits, Bad As Me (Anti-)

On what is inarguably Tom Waits's best album since Rain Dogs a quarter of a century ago, he strolls assuredly across the landscape of American music, turning his hand with equal facility to an extraordinary range of styles, and managing to invent one or two of his own along the way. It must be wonderful to exercise such protean command over one's art, and it's immensely satisfying to witness it wielded by a musician of such remorseless integrity.

Charles Percy: Politician hailed early in his career as the Republicans' answer to John F Kennedy

Today, Charles Percy's moderate politics and his readiness to work across the aisle with Democrats would consign him to the Republican Party's outer darkness. Back in the 1960s and early 1970s, however, those views chimed with the liberal mood of the era, and many thought the young Senator from Illinois was destined for the Oval Office.

Dyson lives up to Ryder billing

Simon Dyson. It was the first name on Paul McGinley's teamsheet and the first out of Ian Poulter's mouth when asked who he expected to graduate from this Seve Trophy to next year's Ryder Cup.

David 'Honeyboy' Edwards: Delta bluesman who played with Muddy Waters and Robert Johnson

David "Honeyboy" Edwards was, almost certainly, the last surviving link with the "Golden Age" of the Delta blues. A friend and associate of many of the genre's seminal figures, including the great Robert Johnson, he was a performer of versatility, integrity and power who continued to hold audiences in his thrall into his tenth decade.

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Isis hostage crisis: The prisoner swap has only one purpose for the militants - recognition its Islamic State exists and that foreign nations acknowledge its power

Isis hostage crisis

The prisoner swap has only one purpose for the militants - recognition its Islamic State exists and that foreign nations acknowledge its power, says Robert Fisk
Missing salvage expert who found $50m of sunken treasure before disappearing, tracked down at last

The runaway buccaneers and the ship full of gold

Salvage expert Tommy Thompson found sunken treasure worth millions. Then he vanished... until now
Homeless Veterans appeal: ‘If you’re hard on the world you are hard on yourself’

Homeless Veterans appeal: ‘If you’re hard on the world you are hard on yourself’

Maverick artist Grayson Perry backs our campaign
Assisted Dying Bill: I want to be able to decide about my own death - I want to have control of my life

Assisted Dying Bill: 'I want control of my life'

This week the Assisted Dying Bill is debated in the Lords. Virginia Ironside, who has already made plans for her own self-deliverance, argues that it's time we allowed people a humane, compassionate death
Move over, kale - cabbage is the new rising star

Cabbage is king again

Sophie Morris banishes thoughts of soggy school dinners and turns over a new leaf
11 best winter skin treats

Give your moisturiser a helping hand: 11 best winter skin treats

Get an extra boost of nourishment from one of these hard-working products
Paul Scholes column: The more Jose Mourinho attempts to influence match officials, the more they are likely to ignore him

Paul Scholes column

The more Jose Mourinho attempts to influence match officials, the more they are likely to ignore him
Frank Warren column: No cigar, but pots of money: here come the Cubans

Frank Warren's Ringside

No cigar, but pots of money: here come the Cubans
Isis hostage crisis: Militant group stands strong as its numerous enemies fail to find a common plan to defeat it

Isis stands strong as its numerous enemies fail to find a common plan to defeat it

The jihadis are being squeezed militarily and economically, but there is no sign of an implosion, says Patrick Cockburn
Virtual reality thrusts viewers into the frontline of global events - and puts film-goers at the heart of the action

Virtual reality: Seeing is believing

Virtual reality thrusts viewers into the frontline of global events - and puts film-goers at the heart of the action
Homeless Veterans appeal: MP says Coalition ‘not doing enough’

Homeless Veterans appeal

MP says Coalition ‘not doing enough’ to help
Larry David, Steve Coogan and other comedians share stories of depression in new documentary

Comedians share stories of depression

The director of the new documentary, Kevin Pollak, tells Jessica Barrett how he got them to talk
Has The Archers lost the plot with it's spicy storylines?

Has The Archers lost the plot?

A growing number of listeners are voicing their discontent over the rural soap's spicy storylines; so loudly that even the BBC's director-general seems worried, says Simon Kelner
English Heritage adds 14 post-war office buildings to its protected lists

14 office buildings added to protected lists

Christopher Beanland explores the underrated appeal of these palaces of pen-pushing
Human skull discovery in Israel proves humans lived side-by-side with Neanderthals

Human skull discovery in Israel proves humans lived side-by-side with Neanderthals

Scientists unearthed the cranial fragments from Manot Cave in West Galilee