Nature 460, 876–879 (2009)

In the Introduction and in the Figure 4 legend of this letter, it was stated that the truncated tetrahedron is the only Archimedean solid that is not centrally symmetric. The correct statement is that the truncated tetrahedron is the only non-chiral Archimedean solid that is not centrally symmetric. This subtle distinction does not affect any of the results, conclusions or conjectures in our paper.