A new study of the Hadza population in Tanzania, forthcoming in the April 2006 issue of Current Anthropology, explores the role of hunting in human evolution. Among chimpanzees and most human populations that subsist on wild resources, hunting is a predominantly male activity, and researchers have long tried to locate the advantage that hunting, a dangerous and tiring activity, brings to men. Though some have argued that good hunters have longer-lasting ties to mates and better-fed offspring, other research suggests that hunting provides an opportunity to garner social attention and increase ones mating prospects, also known as the "showoff hypothesis."
"When asked where they would like to reside, [Hadza] women preferred the camp of good hunters, where more food would be shared with their families," explains Brian M. Wood (a graduate student in biological anthropology at Harvard University). "The choice was not so clear for [Hadza] men: living with bad hunters would showcase their own hunting prowess. Living with good hunters, however, would bring more food to their family, at the cost of lowered relative hunting status."
In a similar study of the Ache hunter-gatherers in eastern Paraguay, also published in Current Anthropology, Wood revealed that a man without dependent offspring is more concerned about his individual prestige as a hunter, and would therefore rather reside among poorer hunters, while one with children, more concerned about access to food, prefers to be with better hunters. However, most participants in the Hadza study opted for a living situation that provided a better flow of nutrients to the household.
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There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.
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New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference
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Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
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