Earth from space: The heel of Italy

The Copernicus Sentinel-2 mission takes us over a section of Italy's heel in the southern part of the boot-shaped peninsula.

Why some plant diseases thrive in urban environments

Rachel Penczykowski, an assistant professor of biology in Arts & Sciences at Washington University in St. Louis, and five WashU graduate and undergraduate students tracked infestations of powdery mildew on common broadleaf ...