Divorce Chinese StyleThis study investigated divorce during China's social and economic transformation period from 1970 to 2012. Specifically, the study examined the trend development of divorce and demonstrated how marriage formation type and individual socioeconomic characteristics were associated with the likelihood of divorce across time. Event-history analysis was applied to longitudinal data from the China Family Panel Studies (2010-2012 waves). The results showed a threefold increase in divorce from the pre-1990s to the 1990s. Surprisingly, the trend shifted to a plateau toward the 2000s. When cohabitation was in its rapidly diffusing stage in the 1990s, individuals who cohabited prior to marriage had a substantially higher likelihood of divorce. As cohabitation became increasingly common in the 2000s, its effect on divorce weakened. The role of socioeconomic characteristics in divorce also varied across time. This study enriches the

Individual data on menstrual cycles of noncontracepting women living in Western countries were used in order to verify whether the biological seasonality of conception persists after sexual behavior is controlled for. Episodes of intercourse were recorded daily, and the time of ovulation was detected by a marker We find that the seasonality of conception changes with woman's age and frequency of episodes of sexual intercourse. In particular; for women aged 27-31 having only one act of intercourse during the six most fertile days of the menstrual cycle, the seasonality of fecundability is stronger In this age group in the Northern Hemisphere, if seasonality of acts of sexual intercourse is controlled, the monthly distribution of probability of conception is bimodal, with two maxima (September and January) and two minima (December and March). When unobserved characteristics of the couples are considered, this seasonal pattern of conception persists.

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