A slice of brain, stained for scrutiny under the microscope. The cross-section of a head of broccoli, run through a funky filter. Or is what you see a dynamic, subarctic environment that researchers love to study, especially when it is rendered in a carnival of unnatural colors? The Yukon-Kuskokwim Delta, in southwestern Alaska, is one of the world’s largest deltas. The state’s two biggest rivers empty separately into the Bering Sea here, and the landscape between them is pocked with thermokarst lakes, shallow depressions created as permafrost melts and sags….
