Today, NASA announced that there is...occasionally...flowing, liquid water on the surface of Mars. What?!
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Looking for SciShow elsewhere on the internet?
2014 RSL Paper in Nature Geoscience: http://www.nature.com/ngeo/journal/v7/n1/full/ngeo2014.html
Perchlorate on Mars: http://www.space.com/21554-mars-toxic-perchlorate-chemicals.html
They Hydrology of Don Juan Pond: https://news.brown.edu/articles/2013/02/antarctica
RSL Exploration Debate: http://www.space.com/30618-mars-water-streaks-rsl-mystery.html