Erratum
The last sentence of the fifth paragraph of the 21 December article by Ruth Levy Guyer and Daniel E. Koshland, Jr., "Diamond: Glittering prize for materials science" (p. 1640), contained an error. It should have read, "Whereas silicon chips can withstand temperatures up to 300°C, one estimate is that diamond chips might be able to withstand temperatures as high as 600°C," not "5000°C."