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On the Cover

March-April 2007 Volume 95, Number 2

On the cover:

The slime mold Dictyostelium discoideum has served as the testing grou...

FEATURE ARTICLES

Plug-in Hybrid Vehicles for a Sustainable Future

Appropriately designed hybrid cars will help wean society off petroleum. The necessary technology is available now

Uncovering Prehistoric Hurricane Activity *

Examination of the geological record reveals some surprising long-term trends

Amber's Botanical Origins Revealed *

Jorge Santiago-Blay, Joseph Lambert

Large collections of the substances exuded by trees today may help to track backward from amber samples to the ancient plants that produced them

Multiscale Modeling in Biology *

Santiago Schnell, Ramon Grima, Philip Maini

New insights into cancer illustrate how mathematical tools are enhancing the understanding of life from the smallest scale to the grandest

Imprinted and More Equal *

Randy Jirtle, Jennifer Weidman

Why silence perfectly good copies of important genes? The answer may lie in a battle between mother and father staged in the genome of their offspring

* access restricted to members and subscribers

SCIENTISTS’ BOOKSHELF

The Origins of 20th-Century Progress

A combined review of Creating the Twentieth Century: Technical Innovations of 1867-1914 and Their Lasting Impact and Transforming the Twentieth Century: Technical Innovations and Their Consequences, both by Vaclav Smil. Technological progress in the 20th century consisted mainly in refining and intensifying the use of machines and processes created before World War I, says Smil

See all book reviews for this issue.

DEPARTMENTS

COMPUTING SCIENCE

Trains of Thought

Computing with locomotives and box cars takes a one-track mind

MACROSCOPE

An Exact Value for Avogadro's Number

Untangling this constant from Le Gran K could provide a new definition of the gram

Ronald F. Fox, Theodore P. Hill

SIGHTINGS

Picturing to Learn

The Inner Life of the Cell is an eight-minute animation from Harvard's Biovisions Initiative

MARGINALIA

By Any Other Name

By giving tumors their right names, scientists gain power over them

ENGINEERING

A theoretician develops his applied side

SCIENCE OBSERVER

Frozen water takes on intricate multi-helixed shapes when confined in tiny spaces at high pressures

Fenella Saunders

Banking on Mitigation

New regulations might change the landscape of national wetlands policy

Sensitive Cells

Stem cells take their cue from their physical surroundings

Christopher R. Brodie

LETTERS TO THE EDITORS

The Tipping Point
Ancient Blow-ups
Ears in Space
Fooling Around
Flowing Along

SIGMA XI TODAY (PDF)

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American Scientist Classics

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