Mark Landler looks at the dynamic between Hillary Clinton and Barack Obama, and charting the rise of Clinton's tendency towards hawkish foreign policy. The world uses and throws away more than 1 trillion plastic bags every year. Should we charge for them in NYC? Roberta Gratz on the life and legacy of a journalist and urban planning activist Jane Jacobs. Eyal Press, a contributor to The New Yorker, investigated Florida prisons where mentally ill inmates were being tortured.