PhysicsEarth's mantle helps hunt for fifth force of nature A new long-range force – mediated by curious "unparticles" – could be detected by letting electrons in the mantle affect particles at ground level ¿ìè¶ÌÊÓÆµ
PhysicsQuantum shadows: The mystery of matter deepens Forget particles and waves. When it comes to the true guise of material reality, what's out there is beyond our grasp, says Anil AnanthaswamyFeatures