classic papers of the week -- 181

On the Electrodynamics of Moving Bodies

or here

• Einstein, A.

Gravitational Lenses

• Liebes, Sidney (Palmer Physical Laboratory, Princeton University)

A single quantum cannot be cloned

• Wootters, W. K. (Center for Theoretical Physics, The University of Texas at Austin); Zurek, W. H. (Theoretical Astrophysics, California Institute of Technology)