Voyage to the north through ramparts of ice

Fram
Nansen wanted to jam a ship into the ice and let drift do the rest

At first sight the great slabs of grey-blue ice covering the Arctic Ocean appear to be rock-solid and immobile but the extraordinary fact is that they are restless and shifting.

Beneath what appears to be an unbending and endless landscape, the winds and currents are constantly at work reshaping it.

During the long dark months of the past winter, Norway's research vessel, the Lance, has been stationed amid the floes and drifting with them at the amazing speed of half a mile an hour.

In the few days I spent on board, when the vessel seemed to be locked in a vice-like grip, we actually travelled about a dozen miles.

The view was essentially unchanging but the satellite navigation system revealed the extent of the drift and the Lance's journey can be seen here.

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Climate drives 'new era' in Arctic Ocean

Changes in the Arctic Ocean are so profound that the region is entering what amounts to "a new era", according to Norwegian scientists.

A switch from a permanent cover of thick ice to a new state where thinner ice vanishes in the summer will have far-reaching implications, they say.

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Arctic mission monitors ice shift

A highly unusual expedition is under way in the Arctic Ocean where a research vessel has been parked in the ice all winter.

Run by the Norwegian Polar Institute, the mission is exploring the big questions of how the region is changing and what this means for the ice and the wildlife.

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Longer-term thinking 'needed' on air pollution

Paris
The UK gets some pollution produced in France, and they get some of ours

Warnings about dirty air come so often that only the most severe seem to catch anyone's attention.

The last major episode to grab the headlines came a year ago when many areas of Britain were blanketed in a noxious brew that turned the skies grey-brown for several days.

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What is the point of the Large Hadron Collider?

inside the LHCb experiment
No small undertaking: the experiments occupy huge subterranean caverns

Every time fundamental research hits the headlines you can be sure that someone - maybe lots of people - will question whether it's worth it.

And so it is with the restart of this mother of all physics experiments, ready after its two-year upgrade to explore uncharted corners of the sub-atomic realm.

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Being comfortable in robotics' uncanny valley

Robot
Safety first: This robot moves out of the way as soon as the human reaches over

The robot's eyes flick towards me, and its head turns, eyebrows raised, lips forming a smile, as if we are about to meet and start a conversation.

In the Edinburgh Centre for Robotics, I am a little disconcerted by my first encounter with an intelligent machine.

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Chernobyl: Containing the world's worst nuclear accident

Rising above the scene of the world’s worst nuclear accident is the spectacular sight of the largest moveable structure ever created on land.

The complex of nuclear power plants at Chernobyl has dominated this corner of northwest Ukraine for decades but the new construction towers over it all.

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Healthy dose of hope for one-use syringes

Syringe

The people of the farming community of Roka in Cambodia are living through exactly the nightmare scenario that the World Health Organisation wants to stamp out with a new policy on syringes.

In wooden huts and farmhouses dotted among paddy fields, families are struggling to cope with the bombshell of a sudden and frightening mass infection of HIV.

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Cannabis: Promise, risk and controversy

Medicinal cannabis sold in Los Angeles before a 2012 ban

Cannabis is bad for you, cannabis is good for you - confused?

That's not surprising. Complicated and controversial, cannabis is revealed by recent science to have a dual personality, with a dark side and a more positive one. Radio 4's PM programme is this week running a whole series on cannabis, and the debate surrounding it.

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Will the falling oil price undermine green energy?

solar panels in Minneapolis
Supporters of renewable energy say it is a more stable option than the volatile fossil fuel market

Common sense would surely tell you that if you slash the cost of one source of energy, then alternatives look less appealing.

You might think, therefore, that the crash in the price of oil must be dealing a potentially fatal blow to renewable power.

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