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http://arstechnica.com/science/2014/0...-a-weird-particle-made-of-four-quarks
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http://www.futura-sciences.com/magazi...quasiparticules-physique-solide-52574
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http://www.theverge.com/2013/7/24/455...me-3d-printers-potential-health-risks
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