Blood

The majestic Great Wall was built with wisdom, dedication, blood, sweat, and tears.

The Aztecs adopted human sacrifice from earlier cultures (such as the Olmecs) because they believed the universe would come to an end and the sun would cease to move without human blood.

There are many ancient statues of gods sticking out their tongues, such as Huitzilopochtli, which may be a sacred gesture that suggests their thirst for blood.

In Sweden, you can order Blodplattar, which are pancakes made out of pork blood.

There's also a clear link between cat ownership and a lowered risk of strokes or heart problems, as a cat's purr lowers blood pressure.

In the original Psycho film, the blood in the famous shower scene was actually chocolate syrup.

When the arteries get clogged, blood does not go through them easily, this can cause a heart attack.