Each labor is different, so there is no clear - cut textbook description of how it could happen for you or the next person. (mamanatural.com)
«The old textbook description says that once maleness is determined by a few Y chromosome genes and you have gonads, all other sex differences stem from there,» says geneticist Andrew Clark of Cornell University, who was not involved in either study. (sciencemag.org)
«Events like this make science fun for children,» said Marcellus, contemplating how she struggled as a young student to understand and fend off boredom triggered by textbook descriptions of Escherichia coli or E. coli. (aaas.org)