Scientific American (2021-10, OctoberA NEW FORCE OF NATURE: An experiment called Muon g-2 at Fermi National Accelerator Laboratory in Illinois measured excessive wobbling by particles called muons. The findings suggest new particles or forces beyond those in the Standard Model of particle physics may be involved.Infinite Math: Mathematicians have expanded category theory into infinite dimensions, enabling new connections among sophisticated mathematical concepts. By Emily RiehlCLIMATE CHANGE: Alaska Burning: Wildfire is transforming the landscape of the high north and amplifying climate change. By Randi Jandt and Alison YorkPSYCHOLOGY: Social Resilience: Underserved Black communities are often depicted as dysfunctional. Their resiliency has long been overlooked. By Nancy AverettPARTICLE PHYSICS: The Unseen Universe: A mismatch between theory and experiment from muons points to possible new particles and forces of nature. By Marcela CarenaBIODIVERSITY: The Big Day: A Connecticut team races to find as many bird species as possible in 24 hours, in the high-intensity, low-stakes world of competitive birding. By Kate WongSUSTAINABILITY: More Food, Less Waste: Cutting losses across the food chain could vastly increase supply and significantly reduce carbon emissions. By Chad Frischmann and Mamta MehraTHEORETICAL PHYSICS: The Artificial Physicist: A machine-learning system is making shocking progress at the frontiers of experimental quantum physics. By Anil Ananthaswamy