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Автор: Martin, Robert D.
Издательство: Basic Books
Год: 2013
Формат: PDF
Страниц: 321
Размер: 32,7 Mb
Язык: English
Despite the widespread belief that natural is better when it comes to sex, pregnancy, and parenting, most of us have no idea what “natural” really means; the origins of our reproductive lives remain a mystery. Why are a quarter of a billion sperm cells needed to fertilize one egg? Are women really fertile for only a few days each month? How long should babies be breast-fed?