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Editor's choice

Jan 19, 2014

A special free-to-read digital edition containing 10 of our very best feature articles on the science and applications of light

In depth: May 2004

Features

Dark energy

The evidence for gravitationally repulsive energy keeps getting stronger

Opinion

New challenges for the EU

What does expansion mean for R&D?

The greatest equations ever

What equations are great, and why?

Reviews

Quantum theory: no problem

Brian Greene has written another best-seller