Issues
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Search and Discovery
Ultrasound resolution beats the diffraction limit
With an acoustic analogue of a Nobel Prize–winning optical technique, researchers can acquire detailed images quickly.
A quantum cascade laser gets a geometric makeover
A change in the cross section and orientation of the laser’s optical cavity collimates an otherwise highly divergent terahertz-frequency beam.
Issues and Events
Volcano research flows from North Korea
An international team of scientists is studying Mount Paektu to understand its past activity and future hazards.
Cancer, brain research, and supercomputing
By contributing to health research, the Department of Energy could transform its approach to designing the next generation of high-performance computers.
Billionaires join governments to fight climate change
Public and private initiatives aim to bring innovative clean energy technologies to market.
Articles
The bicentennial of Francis Ronalds’s electric telegraph
Decades before the work of Samuel Morse, a young Englishman laid out his vision for a future world of telecommunication.
Sensing deep-ocean temperatures
Though not yet widely implemented, the technique of monitoring the ocean’s warming via changes in the speed of sound through the water is a powerful complement to the more common tools available: free-floating thermometers and altimetry satellites.
The peaceful atom comes to campus
Youthful idealism, institutional ambition, and Cold War sensibilities all helped shape the Michigan Memorial–Phoenix Project, the University of Michigan’s tribute to fallen World War II soldiers.
Books
Three Scientific Revolutions: How They Transformed Our Conceptions of Reality
New Products
Obituaries
Lincoln Wolfenstein
Ernst K. Zinner
Quick Study
The surprising dynamics of rolling rings
A ring set spinning on a tabletop can display a rolling behavior that a spun coin will never show.