Humans who have signed up to be frozen cryogenically may be thrilled to hear about a bacterial revival in the Alaskan permafrost. Tunnelers travelling through soil that has been frozen solid for 30,000 years streaked out a sample on a microscope slide, and were shocked to see newly thawed bacteria swimming around!
Someone go thump on Disney's tank!
More seriously, they have to check that they haven't contaminated their samples. And of course, life on mars, blah blah.