Stalking from home to home, a United States Army sergeant methodically killed at least 16 civilians, 9 of them children, in a rural stretch of southern Afghanistan early on Sunday, igniting fears of a new wave of anti-American hostility, Afghan and American officials said.

The court-appointed trustee overseeing the liquidation of MF Global’s brokerage now estimates that the shortfall in the firm’s customer funds could be more than $1.2 billion, double previous estimates.

Regulators currently suspect that MF Global improperly used customer money for its own purposes in the days before filing for Chapter 11 protection, according to people briefed on the matter.

WASHINGTON — Osama bin Laden, the mastermind of the most devastating attack on American soil in modern times and the most hunted man in the world, was killed in a firefight with United States forces in Pakistan on Sunday, President Obama announced.

ON college campuses, the annual race for summer internships, many of them unpaid, is well under way. But instead of steering students toward the best opportunities and encouraging them to value their work, many institutions of higher learning are complicit in helping companies skirt a nebulous area of labor law.

Colleges and universities have become cheerleaders and enablers of the unpaid internship boom, failing to inform young people of their rights or protect them from the miserly calculus of employers. In hundreds of interviews with interns over the past three years, I found dejected students resigned to working unpaid for summers, semesters and even entire academic years — and, increasingly, to paying for the privilege.

ON college campuses, the annual race for summer internships, many of them unpaid, is well under way. But instead of steering students toward the best opportunities and encouraging them to value their work, many institutions of higher learning are complicit in helping companies skirt a nebulous area of labor law.

Colleges and universities have become cheerleaders and enablers of the unpaid internship boom, failing to inform young people of their rights or protect them from the miserly calculus of employers. In hundreds of interviews with interns over the past three years, I found dejected students resigned to working unpaid for summers, semesters and even entire academic years — and, increasingly, to paying for the privilege.

In 1811, John Randel created a proposed street grid of Manhattan. Compare his map, along with other historic information, to modern-day Manhattan.

David E. Rumelhart, whose computer simulations of perception gave scientists some of the first testable models of neural processing and proved helpful in the development of machine learning and artificial intelligence, died Sunday in Chelsea, Mich. He was 68.