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Opinion, arguments & analyses from guest experts and from the editors of Scientific American

Circadian clock without DNA--History and the power of metaphor

Last week, two intriguing and excellent articles appeared in the journal Nature , demonstrating that the transcription and translation of genes, or even the presence of DNA in the cell, are not necessary for the daily ("circadian") rhythms to occur (O’Neill & Reddy 2011, O’Neill et al., 2011)...

February 11, 2011 — Bora Zivkovic

STEREO spacecraft peek at both sides of the sun at once

NASA's STEREO mission has lived up to its name, placing two spacecraft in position to observe both sides of the sun simultaneously. Most solar missions are in mono, so to speak—they rely on a single observatory, from which only one hemisphere of the sun is visible at any given time...

February 7, 2011 — John Matson

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