IT IS well known that superheroes like Superman and Rayman can see through lead and other opaque solids. Although scientists may not qualify for superhero status, novel laser techniques have been developed that can send pulses of light through certain gases without distortion or a loss of intensity. Now, for the first time> Yan Zhao and colleagues at Wayne State University in Detroit, US, have induced transparency in a solid material (Phys. Rev. Lett. 1997 79 641)
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