Where does the sun continually shine even at night? How do penguins keep theireggs warm? How can there be deserts in the coldest places on Earth? This titleunlo... » 

Where does the sun continually shine even at night? How do penguins keep theireggs warm? How can there be deserts in the coldest places on Earth? This titleunlocks the mysteries of the Arctic and Antarctic regions. It looks atexpeditions to the North and South Polesfrom the earliest adventurers tomodern tourist cruiseand investigates how people and animals survive on thesefrozen frontiers. «