US health officials warn dairy workers of bird flu risk from cows, advise to wear protective gear
Nasa's psyche spacecraft sets new record in space communications by transmitting data from over 140 million miles
New model may explain 'cosmic glitch,' where gravity weakens at edge of universe, scientists say
Why haven't we met aliens? Gamma-ray bursts may hold the answer
Moon's crater revealed as origin of mysterious near-Earth asteroid
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