Spirulina

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.

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Society

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What Wikipedia says

Spirulina is the dried biomass of cyanobacteria (blue-green algae) that can be consumed by humans and animals. The three species are Arthrospira platensis, A. fusiformis, and A. maxima. Recent research has further moved all these species to Limnospira.

Excerpt from the Wikipedia article “Spirulina (dietary supplement)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Original uploader was Perdita at the English Wikipedia, Public domain, via Wikimedia Commons.