Puits de Science #02: do we have to measure everything?

René Descartes and Charles Darwin wear their Youtubers' hats in Puits de Science, a series in which they address broad scientific questions. To find answers, they interview several experts and occasionnaly invite other historical figures of science.
Episode 2: How can we measure the world, and why? Leonardo da Vinci explains to us the advantages of an international system of measurement for daily life and scientific research. The current International System of Units uses 7 basic units, 4 of which were given a new definition in 2018: the ampere, mole, kilogram and kelvin. Their new definitions are based on universal constants and are therefore extremely accurate. Accuracy is essential to reveal the flaws of current physics and to discover the secrets of science: that is why the new atomic clocks created at the Observatoire de Paris use strontium instead of caesium.