An interesting article, part of the special series of PNAS 100th Anniversary articles to commemorate exceptional research published in PNAS over the last century. See the companion article, "Analytical Note on Certain Rhythmic Relations in Organic Systems" on page <http://www.pnas.org/lookup/doi/10.1073/pnas.6.7.410>410 in issue 7 of volume 6.

http://www.pnas.org/content/112/31/9493.full

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