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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

Can air pressure help healing?

Under the microscope

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

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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Turkey-Kurdish conflict: Obama's deal with Ankara is a betrayal of Syrian Kurds and may not even weaken Isis

US betrayal of old ally brings limited reward

Since the accord, the Turks have only waged war on Kurds while no US bomber has used Incirlik airbase, says Patrick Cockburn
VIPs gather for opening of second Suez Canal - but doubts linger over security

'A gift from Egypt to the rest of the world'

VIPs gather for opening of second Suez Canal - but is it really needed?
Jeremy Corbyn dresses abysmally. That's a great thing because it's genuine

Jeremy Corbyn dresses abysmally. That's a great thing because it's genuine

Fashion editor, Alexander Fury, applauds a man who clearly has more important things on his mind
The male menopause and intimations of mortality

Aches, pains and an inkling of mortality

So the male menopause is real, they say, but what would the Victorians, 'old' at 30, think of that, asks DJ Taylor
Man Booker Prize 2015: Anna Smaill - How can I possibly be on the list with these writers I have idolised?

'How can I possibly be on the list with these writers I have idolised?'

Man Booker Prize nominee Anna Smaill on the rise of Kiwi lit
Bettany Hughes interview: The historian on how Socrates would have solved Greece's problems

Bettany Hughes interview

The historian on how Socrates would have solved Greece's problems
Art of the state: Pyongyang propaganda posters to be exhibited in China

Art of the state

Pyongyang propaganda posters to be exhibited in China
Mildreds and Vanilla Black have given vegetarian food a makeover in new cookbooks

Vegetarian food gets a makeover

Long-time vegetarian Holly Williams tries to recreate some of the inventive recipes in Mildreds and Vanilla Black's new cookbooks
The haunting of Shirley Jackson: Was the gothic author's life really as bleak as her fiction?

The haunting of Shirley Jackson

Was the gothic author's life really as bleak as her fiction?
Bill Granger recipes: Heading off on holiday? Try out our chef's seaside-inspired dishes...

Bill Granger's seaside-inspired recipes

These dishes are so easy to make, our chef is almost embarrassed to call them recipes
Ashes 2015: Tourists are limp, leaderless and distinctly UnAustralian

Tourists are limp, leaderless and distinctly UnAustralian

A woefully out-of-form Michael Clarke embodies his team's fragile Ashes campaign, says Michael Calvin
Blairites be warned, this could be the moment Labour turns into Syriza

Andrew Grice: Inside Westminster

Blairites be warned, this could be the moment Labour turns into Syriza
HMS Victory: The mystery of Britain's worst naval disaster is finally solved - 271 years later

The mystery of Britain's worst naval disaster is finally solved - 271 years later

Exclusive: David Keys reveals the research that finally explains why HMS Victory went down with the loss of 1,100 lives
Survivors of the Nagasaki atomic bomb attack: Japan must not abandon its post-war pacifism

'I saw people so injured you couldn't tell if they were dead or alive'

Nagasaki survivors on why Japan must not abandon its post-war pacifism
Jon Stewart: The voice of Democrats who felt Obama had failed to deliver on his 'Yes We Can' slogan, and the voter he tried hardest to keep onside

The voter Obama tried hardest to keep onside

Outgoing The Daily Show host, Jon Stewart, became the voice of Democrats who felt the President had failed to deliver on his ‘Yes We Can’ slogan. Tim Walker charts the ups and downs of their 10-year relationship on screen