Discover why veins look blue in fair-skinned people due to how light travels through skin and interacts with blood vessels.

The expression "blue blood" to describe royalty and nobility originated in medieval Spain and has deep cultural and historical roots.

She was the first ‘commoner’ to marry a future monarch in 350 years, but new research has revealed the Duchess of Cambridge has blue blood in her veins. An Australian school teacher has ...

Here’s what blood clots are, how they’re typically treated and what they actually feel and look like so you can know when ...

Octopuses are extraordinary creatures, and their blue blood is just one of the many unusual aspects of their biology.