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Although it might seem a fairly obvious observation, a new study from the University of Iowa has found not only that men, on average, have noses ten per cent larger than womens', they’ve also worked out why this might be.

Leading article: Bolt from the blue

Once upon a time there was the Big Bang theory of the origins of the universe. Now, you could say, we have another, more local, "big bang" – for the origin of life on Earth. According to scientists in Arizona, the crucial components necessary for life to start may not have been generated by our own planet in the first instance, but come from somewhere deep in outer space, carried by the barrage of meteorites that crashed into the earth four billion years ago. The key is the discovery that a meteorite was capable of providing nitrogen-containing ammonia.

Arctic Circle? No, Aberdeen

To many Scots, "The Northern Lights of Old Aberdeen" is a popular traditional song by Mary Webb – the sort of thing your Uncle Jimmy might sing after too many wee drams at Hogmanay, writes Victoria Summerley.

Picture of the Day: Green sky at night, northern delight...

The aurora borealis, or northern lights, hangs like a fluorescent curtain over the village of Ersfjordbotn, near Tromso in northern Norway.

Two parts Hydrogen and one Oxygen; James Cameron’s recipe for disaster

The new 3D film to take the silver screen by storm is Sanctum, the cave-diving adventure produced by the man behind 2009’s biggest hit, Avatar. Laura Davis takes a look at what - other than the extra dimension - makes the film stand out.

David Flatman: I'm riding Tour de France to get fit but still have a mountain to climb

From the Front Row: As Bath's band of injury victims are flogged relentlessly in training, the motivation to return to action has never been greater

Inside the hospital that saves swine flu sufferers' lives

As the number of people with the virus grows, Jeremy Laurance visits one of just five units in Britain that can treat the worst afflicted

Can air pressure help healing?

Under the microscope

Science grapples with the concept that alien life may be among us

It is life, but not as we know it. The first life form on Earth to use deadly arsenic as one of its chemical building blocks has been discovered in a desert lake in California.

Into the abyss: The diving suit that turns men into fish

Humans have proven themselves remarkably adept at learning to do what other animals can do naturally. We have taught ourselves to fly like birds, climb like monkeys and burrow like moles. But the one animal that has always proven beyond our reach is the fish.

The secrets of evolution unearthed in Highlands

The key moment in the history of life on Earth – the tipping point at which there was enough oxygen in the atmosphere to support the evolution of complex animals and plants – occurred about 400 million years earlier than previously thought, a study has found.

Album: Anthony and the Johnsons, Swanlights (Rough Trade)

This can be bought as an album, or with a 144-page hardback book of Antony Hegarty's collages - takes its cue from the previous album's "One Dove", extending further the notions of fauna, flux and transformation that have driven Antony's music since I Am A Bird Now.

Steve Connor: The promise of an unlimited supply for transfusions

More than two million units of blood – some 250,000 gallons – are handled by the transfusion service each year. Yet shortages can and do happen, especially around holiday periods and special events, such as the recent World Cup, when many donors stayed at home.

There will be blood

The most precious liquid in the world is spilled every day on battlefields and in operating theatres. So creating a synthetic version in the lab is more vital than ever, says Roger Dobson

Gulf of Mexico spill has dissipated

The oil slick from the Deepwater Horizon explosion, which threatened beaches and wildlife in the Gulf of Mexico, has largely vanished just two weeks after the crippled BP oil well was finally capped.

'Rotten-egg smell delayed the evolution of animals'

The smell of rotten eggs is off-putting at the best of times, but now scientists believe the same chemical responsible for the awful smell may have held back the evolution of life.

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General Election 2015: Chuka Umunna on the benefits of immigration, humility – and his leader Ed Miliband

Chuka Umunna: A virus of racism runs through Ukip

The shadow business secretary on the benefits of immigration, humility – and his leader Ed Miliband
Yemen crisis: This exotic war will soon become Europe's problem

Yemen's exotic war will soon affect Europe

Terrorism and boatloads of desperate migrants will be the outcome of the Saudi air campaign, says Patrick Cockburn
Marginal Streets project aims to document voters in the run-up to the General Election

Marginal Streets project documents voters

Independent photographers Joseph Fox and Orlando Gili are uploading two portraits of constituents to their website for each day of the campaign
Game of Thrones: Visit the real-life kingdom of Westeros to see where violent history ends and telly tourism begins

The real-life kingdom of Westeros

Is there something a little uncomfortable about Game of Thrones shooting in Northern Ireland?
How to survive a social-media mauling, by the tough women of Twitter

How to survive a Twitter mauling

Mary Beard, Caroline Criado-Perez, Louise Mensch, Bunny La Roche and Courtney Barrasford reveal how to trounce the trolls
Gallipoli centenary: At dawn, the young remember the young who perished in one of the First World War's bloodiest battles

At dawn, the young remember the young

A century ago, soldiers of the Empire – many no more than boys – spilt on to Gallipoli’s beaches. On this 100th Anzac Day, there are personal, poetic tributes to their sacrifice
Dissent is slowly building against the billions spent on presidential campaigns – even among politicians themselves

Follow the money as never before

Dissent is slowly building against the billions spent on presidential campaigns – even among politicians themselves, reports Rupert Cornwell
Samuel West interview: The actor and director on austerity, unionisation, and not mentioning his famous parents

Samuel West interview

The actor and director on austerity, unionisation, and not mentioning his famous parents
General Election 2015: Imagine if the leading political parties were fashion labels

Imagine if the leading political parties were fashion labels

Fashion editor, Alexander Fury, on what the leaders' appearances tell us about them
Phumzile Mlambo-Ngcuka: Home can be the unsafest place for women

Phumzile Mlambo-Ngcuka: Home can be the unsafest place for women

The architect of the HeForShe movement and head of UN Women on the world's failure to combat domestic violence
Public relations as 'art'? Surely not

Confessions of a former PR man

The 'art' of public relations is being celebrated by the V&A museum, triggering some happy memories for DJ Taylor
Bill Granger recipes: Our chef succumbs to his sugar cravings with super-luxurious sweet treats

Bill Granger's luxurious sweet treats

Our chef loves to stop for 30 minutes to catch up on the day's gossip, while nibbling on something sweet
London Marathon 2015: Paula Radcliffe and the mother of all goodbyes

The mother of all goodbyes

Paula Radcliffe's farewell to the London Marathon will be a family affair
Everton vs Manchester United: Steven Naismith demands 'better' if Toffees are to upset the odds against United

Steven Naismith: 'We know we must do better'

The Everton forward explains the reasons behind club's decline this season
Arsenal vs Chelsea: Praise to Arsene Wenger for having the courage of his convictions

Michael Calvin's Last Word

Praise to Wenger for having the courage of his convictions