The uncertainty principle.
D000757:Anencephaly / Q000453:epidemiology; D000818:Animals; D004194:Disease; D005260:Female; D030342:Genetic Diseases, Inborn / Q000235:genetics; D006801:Humans; D007125:Immunogenetics; D007231:Infant, Newborn; D008297:Male; D051379:Mice; D008954:Models, Biological; D011247:Pregnancy; D012306:Risk; D012907:Smoking; D016136:Spina Bifida Occulta / Q000453:epidemiology