Microbes that have been hibernating deep below the Pacific Ocean since the reign of the dinosaurs have been revived in the lab. Some may be 100 million years old, perhaps making them the longest-lived life forms on Earth. Image: Matt McGee
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Look and learn, sloths: the microbes deep beneath the Pacific ocean take inactivity to new heights. They are so slow on the uptake of nutrients from their environment that they barely classify as alive. Their very existence could help define the limit between life and death. Paradoxically, though, they may also be among the oldest living organisms on Earth. Image: Hans Røy/Science/AAAS
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