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The Evolutionary Perspective on Gender DifferencesAccording to evolutionary psychologist Steve Stewart-Williams, almost everyone gets sex wrong. Traditionalists tend to exaggerate natural differences between men and women, while progressives tend to minimize them and assume that nurture and socialization play a decisive role. In his book "A Billion Years of Sex Differences," Stewart-Williams promotes a more nuanced, scientifically rigorous public conversation about why and how men and women differ to guide better policymaking.Understanding the Spectrum of Sex DifferencesStewart-Williams identifies varying degrees of sex differences. Some are relatively pronounced, such as attraction patterns, upper body strength, height, likelihood of committing violence, and occupational interests. Others, like ability in mathematics or conscientiousness, are much more modest. These differences are best visualized as two overlapping bell curves. For example, while the average man is taller than the average woman, there is considerable common ground—knowing someone is 5ft 8in doesn't enable confident gender identification.Research Evidence and Scientific BiasesAs a professor of psychology at the University of Nottingham Malaysia, Stewart-Williams examines various physical, psychological, and cognitive sex differences through an evolutionary lens. He identifies common biases in his field, including "gamma bias" (minimizing differences that paint men in a better light while highlighting those that do the opposite) and "delta bias" (an aversion to traditional sex differences and a preference for the reverse).His research found that when presented with fictitious studies showing men drawing better, lying less, or being more intelligent, people rated them as lower in quality, more harmful, and more worthy of censorship than studies showing women possessed these positive traits.Implications for Gender Equality and PolicyStewart-Williams argues that innate differences don't imply one sex is better than the other, nor do they suggest a moral imperative to enforce sex differences. However, he believes that when given freedom of choice, men and women tend to gravitate toward different directions—men toward working with things and status, women toward working with people and relationships.Interestingly, various studies find that many sex differences—from occupational preference to personality traits—are more pronounced in more gender-equal countries, suggesting that when social constraints are removed, natural tendencies become more evident.The Future of Gender ResearchWhile Stewart-Williams presents compelling evolutionary explanations for sex differences, the reviewer notes that evolutionary psychology isn't always the most useful lens. For example, understanding domestic violence as primarily a manifestation of male aggression rather than patriarchy may overlook how socialization and culture shape behavior in different societies.The book contributes valuable insights to the nature versus nurture debate, but ultimately represents only one part of a complex story about human development and gender relations. Future research will likely need to integrate biological, psychological, and sociological perspectives to fully understand the intricate interplay of factors that shape who we are.

The Science Behind Cold Exposure and Weight Loss Wearing an ice vest or taking daily cold showers could help people lose weight, according to researchers. Despite the growing popularity of cold-water swimming and freezing plunges, to date there is minimal data on the health benefits of cold exposure. But a study of 47 adults with obesity or overweight has found that regular exposure to cold temperatures led to fat loss. The Study's Methodology and Findings Researchers at the University of Nottingham and the Leiden University Medical Center (LUMC) in the Netherlands gave half the participants an ice vest and waist wrap to wear for two hours every morning, while continuing their daily lives. The vests and waist wrap were worn on top of a thin T-shirt and contained gel-filled cooling packs that had been kept overnight in the freezer and maintained a temperature of 15C. In six weeks, participants lost 0.9kg (2lb), made up almost entirely of body fat, whereas the control group did not lose any weight and put on 0.6kg (1.3lb) on average. The Impact of Cold Exposure on Metabolism The lead researcher, Dr Mariëtte Boon, of LUMC, said: “This is one of the first studies looking at the impact of cold exposure over a prolonged period of time, involving people with overweight and obesity.” She added: “Vests like this can be worn at home and so cold exposure could be a simple and inexpensive addition to lifestyle strategies for weight loss such as healthy eating and physical activity.” The Potential for Cold Showers as a Weight Loss Tool The researchers, jointly funded by the Dutch Heart Foundation and the British Heart Foundation, are investigating whether other forms of regular cold exposure could reduce obesity, inflammation and prevent heart disease. The authors are conducting a separate study of 34 women in the Netherlands to see if cold showers also promote fat loss. Half of the women will have their shower on the coldest setting for 90 seconds every morning.