Archaeologists found that prehistoric Indian villagers in southeastern Iowa consumed knotweed and little barley seeds, which were rich in carbohydrates. The discovery sheds light on the diet and agriculture practices of the Oneota Culture, a Native American tribe that lived from 1580 to 1640.
Researchers discovered a genetic basis for the hormonal mechanism regulating drone development in male honey bees, which accelerates their growth and allows them to mature early. The findings provide evolutionary insight into the mechanisms controlling worker bee behavior and could lead to new tools for brain research.
A study by University of Illinois researcher Peter Mulhall found that middle-school-age latchkey youth are three times more likely to say they have ever been drunk, and almost four times more likely to drink in the past month. The study also reveals higher rates of marijuana use and smoking among latchkey youth.
A robot has been taught to play air hockey, a step towards developing intelligent robots that can perform complex tasks. The robot's ability to sense its surroundings and react accordingly opens up new horizons for robotic applications.
The digital hard hat combines functions of a camcorder, tape recorder, notepad, and digital camera into one device. It allows workers to collect, store, receive, and transmit construction-project information via text, images, sound, and video.
Researchers highlight the ongoing threat of ice on small plane wings, which can compromise control and safety. Despite a redesigned deicing 'boot', other aircraft and severe icing conditions remain a concern.
A University of Michigan study analyzes data from various studies to show that whole-body metabolic rate changes over the course of the menstrual cycle, becoming about 7 percent lower after menstruation. This metabolic cycling saves an amount of energy equivalent to six days' worth of food over four menstrual cycles.
Researchers at the University of Wisconsin Medical School have shown that vaccination can reduce or prevent fatal immune responses to a virus in mice, even though the virus continues to live in the animals. This finding has important implications for treating chronic and latent viral infections such as AIDS, herpes, and tuberculosis.
Researchers found that seed corn growers in Illinois using irrigated sandy soils can increase profits by cutting back on nitrogen fertilizer use. Excessive nitrogen application leads to organic nitrogen accumulation in soil microorganisms, hindering crop growth.
Emory University researchers identified a subpopulation of HIV-infected infants with a thymic-defect profile, characterized by low CD4+ and CD8+ T cell counts. These high-risk infants were found to develop AIDS symptoms sooner and have increased mortality rates compared to those without the profile.
A recent University of Illinois study found that using starter fertilizer on no-till corn fields can increase yields by up to 14 bushels per acre. This technique provides early nutrient availability, which is particularly beneficial for no-till farming due to cool and wet soils during the initial growing season.
A study published in the New England Journal of Medicine examines firearm injuries in three American cities, finding that nearly 90% of non-fatal gunshot wounds resulted from confirmed or probable assaults. The study also reveals alarming rates of injury and fatality among young black men, with a rate of 1,708.4 per 100,000 person-years.