The world's largest democracy is changing fast, but India's caste system still prevails in many ways. Somini Sengupta, who covers the United Nation for the New York Times, has lived in both the United States and India, and considers herself part of both countries. Now she's written a book about the world's second most populous nation — expected to surpass China before very long. India is also the world's largest democracy, where 40% of the population is under age 35 and a million people turn 18 every month. Her book is The End of Karma: Hope and Fury Among India's Young.