Bizarre life-forms found thriving in ancient rocks beneath the seafloor - National Geographic

1. Bizarre life-forms found thriving in ancient rocks beneath the seafloor  National Geographic
2. Deep-sea rocks on Earth spark new hope for finding life on Mars  CNET
3. Discovery of life in solid rock deep beneath sea may inspire new search for life on Mars  HeritageDaily
4. Glowing green microbes on Earth could hold the key to life on Mars  Daily Mail
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