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Born during the Rio's meeting in the year 1972, the word biodiversity has become a vernacular word. There is no comprehensive news program on TV or radio without this topic. Anybody knows it today or at least thinks he knows. But what does this word biodiversity mean more precisely? Dealing with the KT boundary and the disappearance of dinosaurs, biodiversity is systematically mentioned and a curve is provided. Speaking about whales, about bears, about corn, biodiversity is claimed. Evoking climate change, its influence on biodiversity is called: "imagine within one century, half of the biodiversity will be disappeared!" Unfortunately, most of the time, nobody feels necessary to precise what this word is supposed to indicate: is it a counted biodiversity or is it an estimated biodiversity? This is true for present days, but it is even more true for the past! What is known and what is supposed to be known? What is the history of biodiversity as compared with the history of Earth? Any scientific item has to be based on curves nowadays, even if people do not try to understand what these numbers or curves represent. Curves and numbers are either "disturbing" or "interesting" according to our ability to take distance with our own job. Obviously this work would also be applied to radiolarians as examples.
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