Issues
Reference Frame
Letters
Search and Discovery
Month-long calculation resolves 82-year-old quantum paradox
A chiral molecule’s transition from a superposition of its left-handed and right-handed isomers to the isomers themselves reveals the nature of the quantum-to-classical transition.
Satellite altimetry quantifies the alarming thinning of Arctic sea ice
A dramatic 57% loss in the volume of perennial ice between 2004 and 2008 may have set the stage for ice-free summers within the next 30 years.
Issues and Events
US electricity grid still vulnerable to electromagnetic pulses
Experts warn lawmakers that an intense solar storm or an attack by a single nuclear weapon could knock out power in an entire region for months.
Articles
Thermochronology and landscape evolution
Radioactive decay, the diffusion of daughter nuclides, and the annealing of fission tracks are being used to develop time-versus-temperature histories of rocks and the processes that sculpt Earth’s surface.
The Aharonov–Bohm effects: Variations on a subtle theme
The notion, introduced 50 years ago, that electrons could be affected by electromagnetic potentials without coming in contact with actual force fields was received with a skepticism that has spawned a flourishing of experimental tests and expansions of the original idea.
Solid-state NMR in biological and materials physics
Ever-improving techniques for manipulating and probing nuclear spins make it possible to obtain detailed structural information about large molecules and disordered compounds.
Books
New Products
Obituaries
Robert Thomas Beyer
John David North
Quick Study
Friction, force chains, and falling fruit
Why is it that stacked apples seem so stable, but removing the “wrong” apple can cause the whole pile to tumble down?