Physics
The hunt for the Un-universe
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Issue 2640
Academics who protested against the pope's plans to speak at an Italian university are facing tough criticism across the country
The fact that naturally occurring substances can be just as hazardous as synthetic ones should not be ignored to press the organic case
Have we been missing an entirely different kind of matter? Zeeya Merali joins the hunt for unparticles
Biotechnology could benefit from the lessons of open source software, but it's important to recognise their differences, says James Love