Infinity Category Theory Offers a Bird’s-Eye View of Mathematics
Mathematicians have expanded category theory into infinite dimensions, revealing new connections among mathematical concepts
Volume 325, Issue 4
You are currently logged out. Please sign in to download the issue PDF.
Features
Wildfire Is Transforming Alaska and Amplifying Climate Change
Although conflagrations in lower latitudes get more attention, wildfires across the high north are affecting the planet even more
Social Capital in Black Communities Is Often Overlooked
Altruism, spirituality and civic engagement are keys to resilience
Weird Muons May Point to New Particles and Forces of Nature
A mismatch between theory and experiment could explain big physics mysteries
Extreme Birding Competition Is a Cutthroat Test of Skill, Strategy and Endurance
A team of birders races to find as many bird species as possible in 24 hours
Massively Reducing Food Waste Could Feed the World
It would also greatly cut greenhouse gas emissions
AI Designs Quantum Physics Experiments beyond What Any Human Has Conceived
Originally built to speed up calculations, a machine-learning system is now making shocking progress at the frontiers of experimental quantum physics
Departments
Advances
Simple Mathematical Law Predicts Movement in Cities around the World
Fossilized Poop Shows How Ancient Dogs Adapted to People
In Case You Missed It
Concrete Buildings Could Be Turned into Rechargeable Batteries
A Frothy Mucus Nest Protects Frog Eggs from Drought
High-Flying Sensor Detects Living Things from Far Above
Save the Right Whales by Cutting through the Wrong Noise
Pathogen-Sensing Mask Could Detect COVID Infection
Today's Wildfires Are Taking Us into Uncharted Territory
See through the Glasswing Butterfly's Fascinating Wings
Listening to a Story Helps Hospitalized Kids Heal
The Venus's Flower Basket's Weird Fluid Dynamics Explained
Policy
A Big Day Birding and a Possible Fifth Force of Nature
Readers Respond to the June 2021 Issue
Abortion Rights Are at the Greatest Risk since Roe v. Wade Was Decided in 1972
Scientists: When Talking to the Public, Please Speak Plainly
50, 100 & 150 Years Ago: October 2021
Conservation
Biodiversity's Greatest Protectors Need Protection
Arts
Poem: 'Earth's Accidents (Over Wadi Qumran)'
Human Machinations around Animals, the Joy of Nature's Eccentricities, and Other New Books
Medicine
Deadly Falls among the Elderly Are on the Rise
Astrophysics