National Geographic covered this story in greater detail here http://news.nationalgeographic.com/2017/02/crystal-caves-mine-microbes-mexico-boston-aaas-aliens-s

National Geographic covered this story in greater detail here http://news.nationalgeographic.com/2017/02/crystal-caves-mine-microbes-mexico-boston-aaas-aliens-science/ http://news.nationalgeographic.com/2017/02/crystal-caves-min...