From the archives: There will be blood

The waterfall of blood, the blood rainbow, humans with green blood, and blood type personalities.

It is a common superstition in Japan that your blood type help to dictate your personality.

Blood Falls
National Science Foundation/Peter Rejcek [Public domain], via Wikimedia Commons

At the end of a glacier in Antarctica is a blood-red waterfall.

Under the right circumstances, you can see a monochromatic blood-red rainbow.

Mikhail Kalugin [CC BY 3.0], via Wikimedia Commons

Bodily fluids can come in a full rainbow of colours. For example, one common drug has a very rare side effect: green blood.

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