Vulcans' unique physiology means their blood appears green instead of red, like humans in the Star Trek franchise.

What happens in our body that make our veins look blue, although they are full of red blood? Follow Tech Insider ... red than the vein itself. So, the color contrast enhances the veins' bluish ...

Period blood color variations, such as bright red, brown, or black, are typically normal and reflect changes in menstrual flow. However, unusual colors like orange or gray combined with discomfort ...

Capillaries, on the other hand, are so small that it takes ten of them to equal the thickness of a human hair. Your body has about 5.6 liters (6 quarts) of blood. This 5.6 liters of blood ...

Amid a plummeting stock market, self-driving cars running amok, and Mark Zuckerberg buying a house in Northwest, another sign ...