Issues
Readers’ Forum
Search and Discovery
Molecular vibrations offer control over electron transfer
A targeted low-energy excitation can dramatically alter the course of charge separation in a molecule.
Stiff yet supple hydrogel mimics cartilage
Magnetically aligned nanosheets give the material its rare combination of mechanical traits.
Giant impacts may explain the origin of chondrules
Long thought to be the building blocks of planets, the small orbs in meteorites may instead be a by-product of planetary accretion.
Issues and Events
Remote makeovers maximize return on spacecraft science
Altered trajectories, spare or repurposed instruments, new software, and other clever tactics can give spacecraft a new lease on life.
From Congress to AAAS, Rush Holt reflects on science policy
The one-time fusion researcher worries that public understanding of climate change is slipping, and says political attacks on social sciences are misguided.
New park will honor US atomic heritage
Provision ensures preservation of World War II–era structures.
Articles
Particle physics and the cosmic microwave background
Temperature and polarization variations across the microwavesky include the fingerprints of quantum fluctuations in the early universe.They may soon reveal physics at unprecedented energy scales.
The physical basis of protein misfolding disorders
Investigations of the fundamental physical principles underlying Alzheimer’s and Parkinson’s diseases are providing new insights into their origins and are suggesting rational strategies through which to combat their onset and progression.
Atomic spins on surfaces
When adapted to cryogenic temperatures and high magnetic fields, a scanning tunneling microscope can assemble and probe spin chains, logic gates, and other configurations of magnetic atoms.
Books
Quantitative Plate Tectonics: Physics of the Earth—Plate Kinematics—Geodynamics
New Products
Obituaries
Martin Lewis Perl
George L. Trigg
Quick Study
Rings of fire: Carbon combustion from soot to stars
During combustion, simple carbon compounds grow into complex lattices. A popular model describing that growth process has now passed its first experimental test.