The purpose of this little book is to invite the reader on a mathematical promenade. We pay a visit to Hipparchus, Newton and Gauss, but also to many contemporary mathematicians. We play with a bit of algebra, topology, geometry, complex analysis, combinatorics, and computer science.

Edward Sapir is undoubtedly one of the most important anthropologists of the early 20th century. Long before the development of structural anthropology, Sapir formulated the philosophy of structuralism and laid the foundations of a general science of behaviour.

This book, is based on ethnographic field studies deals with the phenomena of "biologization" in the field of health, i.e. with all situations where biological causality prevails in the explanation of human health, to the detriment of other interpretations. To what ends, and with what effects?