Being the leader of the free world brings with it incredible power, responsibility and influence. It also involves feelings of seclusion, especially during crises.
President Barack Obama says that, at those times, he turned to books.
"During very difficult moments, this job can be very isolating. So sometimes you have to hop across history to find folks who have been similarly feeling isolated," says Obama, in a wide-reaching interview with Michiko Kakutani, the chief book critic for The New York Times.