## Recent Articles

Astrophysics

### Synopsis: Neutron Stars May Explain Gamma Ray Excess

New models show that neutron stars—and not dark matter—could be responsible for an excess of gamma rays from the Milky Way’s center. Read More »

Nuclear Physics

### Viewpoint: Can Four Neutrons Tango?

Evidence that the four-neutron system known as the tetraneutron exists as a resonance has been uncovered in an experiment at the RIKEN Radioactive Ion Beam Factory. Read More »

Materials Science

### Synopsis: Trees Crumbling in the Wind

Lab experiments with wooden rods help explain why all trees—irrespective of size or species—break when battered by wind blowing at the same critical speed. Read More »

Biological Physics

### Viewpoint: Putting Bounds on Biochemical Noise

Biochemical networks are often poorly characterized, but researchers can still derive limits on the level of the random variations or noise in different network components. Read More »

Interdisciplinary Physics

### Focus: Sensing Delays Control Robot Swarming

A robot group clusters together or disperses based on each robot’s reaction time for sensing light, a finding useful for search-and-rescue missions.   Read More »

Cosmology

### Synopsis: A Little Empty Inside

A new model has allowed researchers to test a theory for why the centers of dark matter halos are less dense than expected. Read More »

FEATURE

### Q&A: Physics of the Animal World

Inspired by snakes, mollusks, and other creatures in the wild, mechanical engineer Anette Hosoi never runs out of new ideas for her research. Read More »

Atomic and Molecular Physics

### Viewpoint: Journey from Classical to Quantum in Two Dimensions

Two separate groups have extracted the thermodynamic equation of state for a two-dimensional gas of fermionic atoms, revealing its peculiar quantum features. Read More »

Quantum Physics

### Synopsis: Tiny Oscillator Works as Photon Changing Room

A new device converts the frequency of a photon using the vibrations in a mechanical oscillator. Read More »