From clean energy investments to emission standards, here's a look at the major steps the US is taking to address climate change and where progress stands.
Learn how the Black Death's three forms—bubonic, pneumonic, and septicemic plague—each caused distinct symptoms, from swollen lymph nodes to blackened skin.
Associative learning isn't tied to one brain region. Here's how the amygdala, hippocampus, striatum, and others each handle different types of learned connections.