Despite a warming climate, bone-chilling winter cold can grip parts of the U.S.—and this study explains why. Researchers found that two specific patterns in the polar vortex, a swirling mass of cold air high in the stratosphere, steer extreme cold to different regions of the country. One pattern drives Arctic air into the Northwest U.S., the other into the Central and Eastern areas. Since 2015, the Northwest has experienced more of these cold outbreaks, thanks to a shift in stratospheric behavior tied to broader climate cycles. In short: what happens high above the Arctic can shape the winter on your doorstep.

Scientists have discovered how a key protein helps maintain strong connections between brain cells that are crucial for learning and memory.

Results of the study, published in the journal Science Advances, could point the way to new treatments for traumatic brain injuries and diseases, such as Parkinson’s and Alzheimer’s, the scientists said.