/r/askscience
AskScience AMA Series: We are the NASA New Horizons team, here to answer your questions about the New Horizons spacecraft, parallax imaging, deep space exploration and what we learned at Pluto. Ask us anything!
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AskScience AMA Series: My name is Thankful Cromartie, and I led the detection of the most massive neutron star ever (to date). Ask me anything!
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Why has Europe's population remained relatively constant whereas other continents have shown clear increase?
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If I went back 100,000 years and mated with a human, would we produce any offspring? How far would I need to go back before I found an ancestor that is incompatible with modern humans?
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