When we think of blood, we usually picture a bright red liquid flowing through veins. That is because most humans and many animals rely on haemoglobin, an iron-rich protein that carries oxygen and ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. Blue blood may look alien, but it’s one of evolution’s most ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. Most people picture blood as red: bright and oxygen-rich ...