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Tag Archives: University of Pennsylvania

Sleeping in space

By Stephen Ornes / January 27, 2013

Long space flights may harm astronauts’ sleep patterns, a 520-day experiment found. Replacing fluorescent bulbs with blue lights like the ones in this photo may help avoid those problems. Credit: ESA

Volunteers face problems on a make-believe mission to Mars

Posted in Body & Health | Tagged attention, experiment, getinvolved, human space exploration, Jeffrey Sutton, Mars, Mathias Basner, Moscow, sleep, space, topstories, University of Pennsylvania

DNA hints at ancient cousins

By Roberta Kwok / August 17, 2012

By analyzing the DNA of some modern-day Africans, scientists have found that our ancestors may have mated with an unknown, humanlike species thousands of years ago. Credit: Courtesy of Sarah Tishkoff

Scientists find evidence of an extinct humanlike species within modern-day Africans

Posted in Ancient Times | Tagged Africans, Cameroon, DNA, getinvolved, Hadza, Harvard Medical School, hominids, Homo sapiens sapiens, Joseph Pickrell, modern humans, Neandertals, Pygmies, Sandawe, Sarah Tishkoff, University of Pennsylvania