Every heard of the chemistry student who was reading about helium?

He just couldn't put it down.

What is the colour of blood?

Spiders, lobsters and snails have blue blood.

Spiders, lobsters and snails have blue blood due to the presence of hemocyanin, which contains copper. Hemocyanins (also spelled haemocyanins) are proteins that transport oxygen throughout the bodies of some invertebrate animals. These metalloproteins contain two copper atoms that reversibly bind a single oxygen molecule (O2). They are second only to hemoglobin in frequency of use as an oxygen transport molecule. Unlike the hemoglobin in red blood cells found in vertebrates, hemocyanins are not bound to blood cells but are instead suspended directly in the hemolymph. Oxygenation causes a color change between the colorless Cu(I) deoxygenated form and the blue Cu(II) oxygenated form.

Hemocyanins are giant multimeric molecules: their most distinctive structural features are a tertiary fold and an oligomeric state - features that are recognisable in proteins from various animal groups including octopi, squid, snails, chitons, some bivalves (molluscs), crabs, lobsters, spiders, scorpions, myriapods, and insects (arthropods).

Wonder why English literature say royals have blue blood. Hmmm...
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