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+ - Scientists create di-positronium molecules->

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doxology writes "The BBC reports that scientists have been able to create di-positronium molecules. A di-positronium molecule consists of two positronium atoms, exotic atoms which are made from an electron and a positron (the anti-particle of the electron). A potential use of these molecules is to make extremely powerful gamma-ray lasers, possibly on sharks."
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+ - Do we need to make voting mandatory?

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gd23ka writes "Australia and Belgium force their electorate to the ballot boxes. Disaffected in Australia and don't want to get out of bed on election day? Pay a fine or go to jail or at least explain why you couldn't come. With these laws on their books both countries enjoy a high percentage of participation in their elections. Proponents say that forced participation in the elections strengthens democracy. What are your thoughts on the matter? You can read Slate's opinion piece first or tell me right away: Is mandatory voting a good idea for America?"

+ - Northern Lights choreographer revealed

Submitted by Anonymous Coward
An anonymous reader writes "Recently four spacecraft, part of the European Space Agency's Cluster mission, provided a behind-the-scenes look at what choreographs the auroras or Northern Lights (at the South Pole they're called Southern Lights). Researchers have known that relative static electric fields, which hover parallel to Earth's magnetic fields, play an important role in the acceleration of electrons that causes the auroras to shine. From the article: In the recent study, one of the spacecraft crossed the auroral arc at high altitude in the Earth's magnetotail. As expected, it detected the U-shaped structure when crossing the boundary within the plasma sheet. Just 16 minutes later another Cluster spacecraft crossed the same boundary and revealed an asymmetric S-shaped structure, which was a surprise since the S-shape was thought to arise at the polar cap boundary. Within that 16-minute period, the plasma density and associated electric currents plummeted at the plasma boundary. So the boundary ended up resembling the steep drop-off in particle density between the aurora edge and the polar cap." This fits with the theory set forth in 2004 by Göran Marklund from the Alfvén Laboratory, that U-shaped circuits form at a plasma boundary between a region within the magnetotail at equatorial latitudes and one at higher latitudes and the S-shapes occur at the boundary between the plasma sheet (at the inner edge of the auroral oval) and the polar cap."

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