Issues
From the Editor
Readers’ Forum
Search and Discovery
Tropical biodiversity faces intersecting threats
As global climate and land use both change, many rainforest species could struggle to find new habitats.
Random walkers illuminate a math problem
A family of tricky integrals can now be solved without explicit calculation.
When a novel metal alloy relieves stress, it chills out
To make solid-state refrigeration technology more efficient, researchers exploit the large, reversible temperature swing of a material comprising nickel, manganese, and titanium.
A tiny swimmer generates rapid, far-reaching signals in water
Colonies of a single-celled organism synchronize their contractions to release toxins that may deter predators.
Issues and Events
Prospect of off-planet outposts spurs interest in space resources
Stakeholders in space exploration consider implications of a transition from science fiction to science fact.
Environmental sustainability goals drive changes in conference practices
Alternative formats for sharing information and facilitating discussion help scientists lower their carbon footprints.
Articles
The stormy fluid dynamics of the living cell
The flows inside cells are intricate and often counterintuitive. Measurements, models, and simulations are helping to unravel the complexities.
Getting rid of the Swedish bomb
Early in the Cold War, Sweden’s leaders planned to acquire nuclear weapons. By the 1960s the country was an international leader of the disarmament movement.
Strange interfacial molecular dynamics
The motion underlying contact interactions that are vital for biology has farther-reaching implications than previously thought.
Books
New Products
Obituaries
Michael Pollak
David James Thouless
Quick Study
When dense crowds act like soft solids
Although mass gatherings of people are normally safe, sometimes their physical interactions prevail over social norms and peaceful events can become disasters.