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On the Cover

September-October 2016
Volume 104, Number 5

In an election season, prospective voters take their impressions of the candidates not only from what they say but also on the basis of other aspects of their presentation, such as intonation, gestures, and appearance. Recent studies have identified another trait that contributes subtly but significantly to voters’ impressions....


FEATURE ARTICLES

How Voice Pitch Influences Our Choice of Leaders

Casey A. Klofstad, Stephen Nowicki, Rindy C. Anderson

Candidates’ vocal characteristics influence voters’ attitudes toward them.


Invasion of the Flatworms *

Ronald Sluys

Easily hidden in imported plants, some land flatworms are conquering the world.


Mathematical Induction and the Nature of British Miracles *

Daniel S. Silver

A mathematical method of proof challenged traditional beliefs.


Seeds on Ice

Cary Fowler

In the Arctic Circle, the Svalbard Global Seed Vault is not waiting for doomsday, but is a secure backup for crop diversity.


* access restricted to members and subscribers


DEPARTMENTS

FROM THE EDITORS

Dealing with Isolationism

Jamie L. Vernon

TECHNOLOGUE

Less in Space

It’s smaller than a breadbox and the biggest thing in satellites since Sputnik.

Paulo C. Lozano

ENGINEERING

Paying for Roads and Bridges*

American infrastructure is vitally important, yet decaying. Where are the funds going to come from to fix it, and how can the persistent plague of graft be eliminated?

Henry Petroski

INFOGRAPHIC

The Recycling Rates of Smartphone Metals


LETTER TO THE EDITORS

Views After Flint Crisis

A Tight Spot for Humans

Traffic Signal Behavior

PERSPECTIVE

Zika Goes Viral

While the Zika virus has its moment, few people are discussing the problems underlying the worldwide increase in emerging infectious diseases.

Robert L. Dorit

SIGHTINGS

Tugging at Hearts

Proper heart-valve development requires cyclic mechanical loading.

Robert Frederick

SPOTLIGHT

Dispatches from Lindau

Nobel laureates mentor young scientists at their annual meeting in Lindau, Germany.

Brian Malow

First Person: Andrea L. Bertozzi and P. Jeffrey Brantingham

Q&A about the “Predictive-Policing” that allows law enforcement departments to tailor where police officers are placed in order to better prevent crime.

Fenella Saunders

Briefings


SIGMA XI TODAY (PDF)


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