PBS NewsHour

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Thousands of Yazidi and Christian people flee Hamdaniyah town of Mosul to Erbil after the latest wave of Islamic State Group advances that began on Sunday has seen a number of towns near Iraq’s second largest city Mosul fall to the militants...
In space, no one can hear you snore. Astronaut Mike Hopkins takes a spacewalk outside the ISS in December, 2013. Photo by NASA According to the longest sleep study ever conducted in space, astronauts’ use of sleeping pills, such as Ambien, is...
A 2.6 million lightyear bridge of hydrogen gas — the largest known — stretches from a large galaxy located at the bottom left to the galaxy at the top. Image by Rhys Taylor/Arecibo Galaxy Environment Survey/The Sloan Digital Sky Survey...