Chitin

Rarity: Ultra rare

A topic known all over the world: only a few thousand cards.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Invention

Domain

Society

Knowledge cost

5

In collections

Nobody has pulled it yet.

What Wikipedia says

Chitin (C8H13O5N)n ( KY-tin) is a long-chain polymer of N-acetylglucosamine, an amide derivative of glucose. Chitin is the second most abundant polysaccharide in nature (behind only cellulose); an estimated 1 billion tons of chitin are produced each year in the biosphere.

Excerpt from the Wikipedia article “Chitin”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: BaptisteGrandGrand, CC BY-SA 4.0, via Wikimedia Commons.