In a recent paper published in Antarctic Science, researchers propose that the reddish coloration at Blood Falls could be the ...

Period blood color can change from bright red to dark red, pink, or brown at different points during menstruation, though it's not typically an indicator of your overall health. Color can change with ...

Scientists found an Antarctic glacier suddenly spewing blood-red water, and through a number of tests, they've uncovered what's causing the strange phenomenon.

Dr. James Faber is professor of cell biology and physiology at the UNC School of Medicine. Here he explains how principles of chemistry and physiology combine to create the color scheme of blood.

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. Most people picture blood as red: bright and oxygen-rich ...