Rivers, streams, lakes, and reservoirs aren't just scenic parts of our landscape -- they're also vital engines for life on Earth. These inland waters 'breathe' oxygen, just like we do. But a new study ...

Though wildly different in so many ways, Earth and Saturn's moon Titan have something important in common. Among all the ...

Want to know more about the four stages of the menstrual cycle? We asked the experts to explain what's going on in the body, ...