NOVA explores the mysterious ecosystem of the desert: a snowstorm; a lashing summer monsoon; and the emergence—in a pool created only minutes before—of a pair of adult spadefoot toads. Toads who had been waiting beneath the sand for a year for this brief and fortuitous moment to procreate the next generation...

There's one place on earth where no one will ever catch a cold. And the freezing waters are so bitter there that a fish has been discovered to have developed its own anti-freeze. NOVA explores Antarctica—the coldest desert in the world.