Issues
Readers’ Forum
Search and Discovery
Earth-size exoplanets in habitable orbits are common
NASA’s Kepler orbiter has clarified the demographics of planets orbiting Sun-like stars.
Nuclear magnetic resonance takes a reaction’s temperature
A new technique exploits the inverse relation between temperature and the linewidth of a proton resonance.
Explaining our two-faced Moon
New computer simulations of asteroid impacts on the Moon reveal why the basins on its near side are almost twice as wide as those on its far side.
Issues and Events
Scoping out the North American continent, 10 years on
Designed as a sort of inward-looking telescope, EarthScope is addressing longstanding questions and making serendipitous findings.
State science academies seek their niche
A fledgling Virginia academy hopes that bringing state scientists together will catalyze interdisciplinary projects.
Articles
Tasting music like wine: Sensory evaluation of concert halls
How do acoustics affect a concertgoer’s experience? With the right tools, we can learn a lot by asking listeners to tell us in their own words.
Bohr’s molecular model, a century later
The Bohr model, newly reconciled with quantum mechanics in the limit of infinite dimensions and modestly extended, yields surprisingly accurate predictions for hydrogen and other small molecules.
Paul Ehrenfest’s final years
New access to his correspondence sheds light on the tragic life and death of one of the pioneers of modern physics.
Books
New Products
Obituaries
Harold Melvin Agnew
John Richard Clem
Quick Study
The math behind the scene of the crime
A mathematical model based on well-documented features of criminal behavior illuminates why crime hot spots form, and it can direct police to the most efficient use of their resources.
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