July-August 2025
Volume: 113 Number: 4
Unseen animals can often still be heard. That’s part of the impetus behind the growing field of ecoacoustics, which aims to measure entire soundscapes in different habitats as a way of gauging an ecosystem’s health over time. Becky E. Heath and her colleagues have been particularly interested in studying the tropical rainforests of Malaysian Borneo, as shown on the cover. But first, as Heath details in “The Ecoacoustics of Forests” they have to be able to make reliable, high-quality, directional recordings. Heath and her colleagues have been working on a spatial recording device, shown at center, which incorporates multiple microphones that each can pinpoint the direction from which a sound originates. The microphones also operate without any recording delays that would cause error in calculations of sound distance or direction. Working with animal sound databases and machine learning technologies, Heath and her team have shown that their recordings can be used to estimate species abundance in different areas. (Cover art by Beatriz Ortiz.)
In This Issue
- Astronomy
- Biology
- Chemistry
- Communications
- Engineering
- Environment
- Ethics
- Evolution
- Medicine
- Physics
- Policy
- Psychology
- Technology
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January-February 2012
Volume: 100 Number: 1
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"How to Be Manipulative," by Robert M. Pringle
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"Runaway Devils Lake," by Douglas Larson
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Classic: "The Experimental Analysis of Behavior," by Stephen F. Ledoux
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November-December 2011
Volume: 99 Number: 6
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"Empirical Software Engineering," by Greg Wilson and Jorge Aranda
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"Making Biofuel from Microalgae," by Philip T. Pienkos, Lieve Laurens and Andy Aden
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"Whatever Became of Holography?," by Sean F. Johnston
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September-October 2011
Volume: 99 Number: 5
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"Tardigrades," by William R. Miller
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"Self-healing Polymers and Composites," by S. R. White, B. J. Blaiszik, S. L. B. Kramer, S. C. Olugebefola, J. S. Moore and N. R. Sottos
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"Urbanism on West Africa's Slave Coast," by J. Cameron Monroe
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July-August 2011
Volume: 99 Number: 4
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"Giant Viruses," by James L. Van Etten
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"The Future of Time: UTC and the Leap Second," by David Finkleman, Steve Allen, John H. Seago, Rob Seaman and P. Kenneth Seidelmann
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"Alone in the Universe," by Howard A. Smith
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May-June 2011
Volume: 99 Number: 3
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"Global Energy: The Latest Infatuations," by Vaclav Smil
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"Marking Loons, Making Progress," by Walter Piper, Jay Mager and Charles Walcott
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"Pliocene Climate Lessons," by Marci Robinson
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"Porphyrins: One Ring in the Colors of Life," by Franck E. Dayan and Emilie A. Dayan
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March-April 2011
Volume: 99 Number: 2
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"Refuting a Myth About Human Origins," by John J. Shea
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"Ancestors of Apollo," by Dennis Danielson
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"The Evolution of Cave Life," by Aldemaro Romero
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January-February 2011
Volume: 99 Number: 1
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"Fractures and Bindings of Consciousness," by Don M. Tucker and Mark D. Holmes
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"From Treasury Vault to the Manhattan Project," by Cameron Reed
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"Chromatin Evolving," by Gregory A. Babbitt
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Classics: "Galaxies," by Virginia Trimble
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November-December 2010
Volume: 98 Number: 6
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"An Empire Lacking Food," by Craig McClain
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"The Anatomy of a Neutron," by Timothy Paul Smith
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"The 95 Percent Solution," by John Falk and Lynn Dierking
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September-October 2010
Volume: 98 Number: 5
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"Evolution on a Frozen Continent," by David Lambert, Craig Millar, Siva Swaminathan and Carlo Baroni
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"High-power Lasers," by Todd Ditmire
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"A Bigger, Better Brain," by Maddalena Bearzi and Craig Stanford
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"Gifts and Perils of Landslides," by Kenneth Hewitt
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July-August 2010
Volume: 98 Number: 4
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"Ivermectin and River Blindness," by Philip A. Rea, Vivian Zhang and Yelena S. Baras
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"Liquid Fluoride Thorium Reactors," by Robert Hargraves and Ralph Moir
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"Wiggling Through the World," by Daniel I. Goldman and David L. Hu
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"Science After the Volcano Blew," by Douglas W. Larson
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