## Viewpoints

### Observing the Great Spin and Orbital Swap

September 15, 2014

The experimental observation of spin-orbital exchange interactions in ultracold atoms opens a window for the exploration of poorly understood magnetic behaviors.

### Diamond and Silicon Get Entangled

September 11, 2014

Two silicon-vacancy centers in diamond can emit photons that are indistinguishable—suggesting they have potential as building blocks for a diamond-based quantum computer.

### Microwave Photons Move Out of Equilibrium

September 8, 2014

A circuit for microwave photons provides a useful test bed for nonequilibrium physics.

### The Beginning of Extra-Galactic Neutrino Astronomy

September 2, 2014

What can high-energy neutrinos tell us about astrophysical objects beyond our galaxy?

## Synopses

### More Dark Matter Hints from Cosmic Rays?

September 18, 2014

A particle detector onboard the International Space Station has revealed differences between the spectrum of cosmic-ray positrons and electrons, which might be a hint of dark matter annihilation processes.

### Patchy Particles without the Patches

September 17, 2014

Mobile DNA strands could provide a different way to patch together DNA-coated particles to form colloidal structures whose structure and function can be tailored.

### Relativity is Right on Time, Again

September 16, 2014

An experiment with fast-moving ions verifies relativistic time dilation to a new level of precision, placing constraints on certain quantum gravity theories.

### Testing the Weak Interaction with Potassium

September 11, 2014

Potassium-37 is one of several isotopes that could be used to directly test the standard model weak interaction.

## Focus

### Electron Handedness Affects Gas Molecule Breakup

September 12, 2014

Experiments show that beams of left- or right-handed electrons are not equal-opportunity destroyers of molecules having two mirror-image forms, which supports the idea that primordial cosmic rays generated the asymmetry in biological molecules.

### High-Precision Measurements Using Lots of Cold Atoms

September 5, 2014

A new technique uses up to $30$ Bose-Einstein condensates simultaneously to make ultraprecise measurements.

## Notes from the Editors

### Physics Survey

September 8, 2014

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