As many students return to school, we look at how teaching became America's most embattled profession.
Crossing Antarctica with Borge Ousland
Wondering what it might be like to travel across Antarctica by yourself? National Geographic Explorer Borge Ousland has done it.Ousland explains how he prepared — mentally and physically — for the trek. He also compares it to traveling solo for 82 days from Siberia to Canada by way of the North Pole.