Blood Falls in Antarctica flows unpredictably with iron-rich, salty water. Microbes inside survive without sunlight.

The color of menstrual blood is a key indicator of women's health, and while bright red is the most common, it's not the only one. Menstrual blood can range from dark red to brown, black ...

A stream winding through a populous area on the outskirts of Buenos Aires has turned crimson red in recent hours that has ...