Did you ever wake up from a long nap feeling a little disoriented, not quite knowing where you were? Now, imagine getting a wake-up call after being "asleep" for 42,000 years. In Siberia, melting permafrost is releasing nematodes — microscopic worms that live in soil — that have been suspended in a deep freeze since the Pleistocene. Despite being frozen for tens of thousands of years, two species of these worms were successfully revived, scientists recently reported in a new study.