CONTENTS: Chronobiological analysis of the main events in the obstetric pathophysiology of Mulier sapiens: I) Embryogenesisrisk of teratogenesis; II) From prematurity to post-didacticism: from eutocic labor to cervical cerclage; III) Night and labor: higher incidence of nocturnal labor (physiological facilitation) and daylight cesarean section (choice of the obstetrician); IV) The moon and labor -non-conclusive results; V)

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Although research and operating room accidents are regrettable, some of them happen and may sometimes lead to spectacular advances, such as heroic treatments and even Nobel Prizes. Open-mindedness is a common trait to those willing to count on grand prize, as American physicist Henry would state (1842): 'Seeds of discovery are constantly floating around us, but the onlytake roots in minds well prepared to receive them'.

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