Chicago's eastern boundary is formed by Lake Michigan, and the city is divided by the Chicago River into three geographic sections: the North Side, the South Side and the West Side. These sections ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. After a steep ...

NASA’s Mars Exploration Program (MEP) is a science-driven, robotic-focused effort to characterize and understand Mars, including its current environment, climate… Explore this page for a curated ...