Terry Gross

Seth Mnookin, a contributing editor at Vanity Fair, describes live-tweeting the events at MIT.

Charles Sennott, vice president, executive editor and co-founder of GlobalPost, talks with Fresh Air's Terry Gross about the ongoing manhunt in Boston.

In a new documentary premiering on HBO, the journalist explores the life of his friend, the war photographer Tim Hetherington. The two collaborated on the 2010 documentary Restrepo, and Junger was profoundly changed after Hetherington was killed by shrapnel in Libya in 2011.

In a cover story for The New Republic, journalist Jonathan Cohn examines the conundrum of day care in the United States. "On the one hand," he says, "improving the quality of child care ... is going to take more money. On the other hand, it already costs more than many families can pay."

Marathoner and Runner's World contributor Amby Burfoot talks about the vulnerability of running 26.2 miles of public space, the Boston Marathon as a holy grail and the importance of being cheered on. Burfoot won the Boston Marathon in 1968 and has run every five years since. He was there Monday.

Sports columnist Dan Shaughnessy talks with Fresh Air's Terry Gross about Monday's events at the Boston Marathon, the place the marathon holds in the life of the city, its importance in the international world of running, and the history of attacks at sporting events.

Nearly 15 million Americans have a moderate to severe food allergy. In kids, the rate is on in 13. Kari Nadeau, who studies food allergies at Stanford, in currently testing a technique to desensitize children who have multiple severe allergies to foods like nuts, soy, milk, wheat and shellfish.

In Who Could That Be at This Hour?, a prequel to A Series of Unfortunate Events, Daniel Handler satirizes pulp mysteries and uncovers the parallels between detective fiction and childhood. In both, he says, an outsider is trying to make his way in a mysteriously corrupt world.

In the United States, an orphan disease is one that affects fewer than 200,000 patients. These conditions often involve chronic pain or fatigue, and can be controversial and difficult to diagnose. Yet they affect around 30 million Americans. Author Laurie Edwards is one such patient.

The CIA has morphed from a traditional espionage service concerned with stealing the secrets of foreign governments into an organization consumed with hunting down its enemies. New York Times journalist Mark Mazzetti chronicles this transformation in a new book, The Way of the Knife.