The piece of lab-grown meat had an artificial circulatory system of hollow fibers delivering nutrients and oxygen.

The blood vessels are a bit like roads going around a city with deliveries, while the veins take away waste ... it would go all the way around the world…twice! Of course, you could only drive ...

whether it's pulsing in your veins or gushing from a wound. Skin scatters more blue light than red. The effect is amplified even more by an optical illusion. Skin around the vein looks more red ...