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Understand

August 21, 2012 | Issue 24

The new definition of crystals – or how to win a Nobel Prize

Why is symmetry so central to the understanding of crystals? And why did ‘forbidden’ symmetry change the definition of crystals themselves?

Ages: 11-14, 14-16, 16-19;
Topics: Physics, Mathematics, General science, Chemistry
       

Understand

July 27, 2006 | Issue 2

Symmetry rules

Everyone knows what symmetry is. In this article, though, Mario Livio from the Space Telescope Science Institute, Baltimore, USA, explains how not only shapes, but also laws of nature, can be symmetrical.

Ages: 14-16, 16-19;
Topics: Physics, Mathematics