The systematic, careful collection of measurements or counts of relevant quantities is often the critical difference between pseudo-sciences, such as alchemy, and science, such as chemistry or biology.
Umaɣ almaɣna əd aƭinan ən hakotan meɣ ən asiƭin ən haditan iknanen eqalan agudiyan təbiɗawt in gar pseudo-tənumaɣen, sund alshimi, ən tənumaq, sund əhimie meɣ biologie.