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(PhysOrg.com) -- Physicists have a new theory on the mysterious mechanism that causes the explosion of massive, or core, stars. These ‘Type II supernovae’, the term given to exploding core stars, are huge and spectacular events – intriguing because for a short time they emit as much light as is normally produced by an entire galaxy

Brazil's President Dilma Rousseff has signed a provisional bill that would allow manufacturers of tablet PCs to sidestep a 9.25% social-security tax and benefit from a reduction in the industrial-production tax, which would drop from 15% to 3%.