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Science 5 May 2006:
Vol. 312. no. 5774, p. 711
DOI: 10.1126/science.1126255
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Perspectives

RETROSPECTIVE:
Nicholas J. Shackleton (1937-2006)

William F. Ruddiman

N. J. Shackleton was a scientific explorer who developed ways to extract climate data from the sea floor and found that the periodic appearance of ice sheets is governed by Earth's orbit.

The author is in the Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22904, USA. E-mail: wfr5c{at}virginia.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)