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South African rock shelter artifacts show early humans colonized inland areas

South African rock shelter artifacts show early humans colonized inland areas

Science
March 31 (UPI) -- Archaeological evidence from a rock shelter in South Africa suggests early humans colonized a variety of environments, including inland settings, undermining theories linking the origins of our species to the coast. For generations, the rock shelter on Ga-Mohana Hill, positioned at the edge of South Africa's Kalahari Desert, has served as a spiritual site for local people. But until now, researchers weren't sure how long the shelter has been used by humans. Advertisement To find out, archaeologists excavated a collection of white calcite crystals and ostrich eggshell fragments, thought to be used as water vessels. Researchers detailed their excavation and analysis efforts in a new paper, published Wednesday in the journal Nature. "The crystals point towards spiritual or...
SLS: Nasa’s ‘megarocket’ engine test ends early

SLS: Nasa’s ‘megarocket’ engine test ends early

Science
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Mergers may have stunted growth of early galaxies

Mergers may have stunted growth of early galaxies

Science
Jan. 11 (UPI) -- Galaxy mergers in the early universe may have curbed star formation and stunted the growth of young galaxies, according to a new study published Monday in the journal Nature Astronomy. Over the years, scientists have observed large numbers of massive, dead galaxies in the nearby universe. Astronomers have struggled to explain how these galaxies, populated mostly by dead stars, came to be. Advertisement In a new paper, researchers suggest an ancient galaxy merger called ID2299 can offer clues. Using images captured by the European Southern Observatory's Atacama Large Millimeter Array, located in Chile, scientists were able to study ID2299 in detail. As the images revealed, the merger that formed ID2299 sent large amounts of star-forming gas into the intergalactic medium. ...
Covid-19: Trump rejects plan for early vaccines at White House

Covid-19: Trump rejects plan for early vaccines at White House

World
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Childhood depression closely linked to diseases, early death, study says

Childhood depression closely linked to diseases, early death, study says

Health
Dec. 9 (UPI) -- Children with depression are at significantly increased risk for diseases linked to mental health issues and early death, according to a study published Wednesday by JAMA Psychiatry. The analysis of more than a million people treated in Sweden for depression as children found that men and women who were depressed during their youth were six times as likely to die at a young age, the data showed. Advertisement In addition, childhood depression suffers had an eight times higher risk for developing sleep disorders in adulthood, according to the researchers. This could include trouble sleeping or excessive daytime sleepiness, a disorder that causes sufferers to fall asleep during daytime hours, the researchers said. "Depressed children and teenagers have an increased risk of ...