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New frog discovered in New York City
Why the 'Man in the Moon' faces Earth
Jilted fruit flies turn to alcohol
Fertilisers behind increase in N2O levels
Early Earth hazy one day, clear the next
Could air pollution be making us fat?
Frog skin protein may help fight superbugs
Electrotherapy dampens brain connections
Satellite images spot early settlements
Chemistry helps sperm find the right egg
Social butterflies find safety in numbers
Ibuprofen reduces altitude sickness: study
Mercury findings raise new questions
Megafauna collapse led to mega changes
New device invisible to magnetic fields
Travelling gnome answers weighty question
Study throws Moon theory up in the air
James Cameron reaches bottom of Pacific
Link builds between extremes and warming
Some chocolate-eaters have lower BMI
Dingoes, devils may be angels in disguise
Barefoot running less energy efficient
Dolphin males share human social network
Recycled spectacles twice that of new: study
New device invisible to magnetic fields
A device invisible to a static magnetic field that could have practical military and medical applications has been developed by European researchers.

Fedor Gomory and colleagues in Slovakia and Spain designed a cloak for a direct current, or DC, magnetic field that is static and produced by a permanent magnet or coil carrying a direct current.

DC magnetic fields are used in MRI imaging devices, in hospitals and in security systems, such as those in airports.

The researchers' device, described in the journal Science, features a cylinder with two concentric layers. While the inner layer consists of a superconducting material that repels magnetic fields, the outer layer is a ferromagnetic material that attracts them.

Placed in a magnetic field, the device has no effect on the field lines, showing neither a shadow nor a reflection. So an object inside the device cannot be detected.

"There are many applications - for some cars, ships or a submarine," says study co-author Alvaro Sanchez of the Autonomous University of Barcelona.

He says the device could also be used for patients who have a pacemaker and need a MRI of a knee or other body part, so the image would not be distorted.

Because it is made from commercially available materials, as well as operating under relatively strong magnetic fields and relatively warm liquid nitrogen temperatures, the device could easily be put to practical use, according to the authors.

"For the submarine, you have to make a shell around the submarine that will make the submarine magnetically undetectable," says Sanchez.

"This could also be used to protect some (military and medical) equipment against electromagnetic disturbances."

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Fossil raindrops reveal early atmosphere
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