Current Biology says, "Tardigrades, commonly known as water-bears, are among the most desiccation and radiation-tolerant animals and have been shown to survive extreme levels of ionizing radiation." They are the only animal that have survived combined exposure to space vacuum and solar radiation.
Tardigrades can put themselves in an extreme hibernation state, known as the "tun" state. Tardigrades have been completely dried out and then resurrected ten years later. They are not rare and can be found nearly everywhere on Earth, including your backyard. Take a look:
Goldstein's tardigrades lab can be found here. Another interesting video about tardigrades can be found here.
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