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On the Cover

March-April 2015
Volume 103, Number 2

Nomadic army ants (Eciton burchelli), such as these individuals from a captive colony at the California Academy of Sciences, form living bridges with their bodies to cross gaps along their foraging trails. All ant trails are marked by species-specific pheromones, although their chemical composition remains unknown for most of the world’s 20,000 or more ant species...


FEATURE ARTICLES

Wyatt TOC Image

How Animals Communicate Via Pheromones

Tristram Wyatt

Human behaviors are probably influenced by invisible smell signals, just like all other animals.


Carbon Nanotubes Deliver in Medicine *

Khuloud T. Al-Jamal

TOC Al-Jamal

Attaching compounds to these hairlike devices turns them into powerful tools for imaging and targeted therapies.


The Origins of Lying and Deception in Everyday Life *

Michael Lewis

TOC Lewis

How do children make sense of the complex social code that dictates when they should or should not lie?


Phytoliths: The Storytelling Stones Inside Plants *

Thomas C. Hart

TOC Hart

These microscopic structures, which arise from silica present in plant tissues, are finding a wide variety of uses, from archaeology to forensics.


What Next for Particle Physics?

Jon Butterworth

TOC Excerpt

The discovery of the Higgs boson at the Large Hadron Collider was a triumph for the Standard Model. Now the hunt is on for a deeper theory of reality.


* access restricted to members and subscribers


SCIENTISTS’ NIGHTSTAND

If These Cubicles Could Talk

Dianne Timblin

A brief review of Fearless Genius: The Digital Revolution in Silicon Valley, 1985–2000, by Dianne Timblin

See all book reviews for this issue


DEPARTMENTS

FROM THE EDITORS

Science Beyond the Headlines

Jamie L. Vernon

COMPUTING SCIENCE

100-Billion-Body Problem

A full-scale computer simulation of the galaxy we call home must trace the motions of at least 1011 stars and other objects over several billion years.

Brian Hayes

ENGINEERING

Second Life of a Tied-Arch Bridge*

After more than a century of service in Lawrence, Massachusetts, a historic work of structural engineering found a new home at Merrimack College.

Henry Petroski

PERSPECTIVE

The Increasing Problem of Nutrient Runoff on the Coast

As development increases along coastlines worldwide, water quality—and everything that depends on it—degrades.

Ashanti Johnson, Melanie Harrison

ARTS LAB

Walking the Edge of the Earth

Eve Mosher’s art project HighWaterLine takes climate science to the streets.

Leila Christine Nadir

2015-03ArtsLabFA.jpgClick to Enlarge Image

SIGHTINGS

Seismic Visions of Middle Earth

Abundant seismic data, new mathematical analyses, and powerful supercomputers are yielding a detailed look beneath the ground, into Earth’s mantle.

Catherine Clabby

2015-03SightingsFD.jpgClick to Enlarge Image

ETHICS

The Forgotten Father of Epigenetics

A theory put forward in the 1930s by E. E. Just, embryologist and African American, shares surprising connections with our emerging understanding of development.

W. Malcolm Byrnes

SPOTLIGHT

Climate Change and Cholera

Research from many fields is uncovering important connections.

Sandra J. Ackerman

Iron in the Sun

An interview with experimental physicist James Bailey about re-creating conditions deep within the Sun, albeit briefly and on a small scale.

Fenella Saunders

Briefings

LETTERS TO THE EDITORS

Testosterone in Women

Correlation vs. Causation

Diseases Without Borders

What Is Programming?


SIGMA XI TODAY (PDF)


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