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Twitter launches emergency alerts

Twitter on Wednesday launched a system for emergency alerts which can help spread critical information when other lines of communication are down.

dateSep 25, 2013 in Internet
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NASA sees new salt in an ancient sea

(Phys.org) -- The expansion of massive salt evaporation projects on the Dead Sea are clearly visible in this time series of images taken by Landsat satellites operated by NASA and the U.S. Geological Survey.

dateApr 09, 2012 in Earth Sciences
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