Editors' Picks

SCIENCE A Spat Over the Search for Killer Asteroids By KENNETH CHANG A former Microsoft technologist questions NASA's efforts to identify space rocks and their proximity to Earth. OPINION | OP-ED CONTRIBUTORS Moving On in Vietnam, but Remembering Its Lessons By JOHN KERRY, JOHN MCCAIN and BOB KERREY As President Obama visits the country where we once fought, we look at a war rapidly fading from memory and at a future full of promise.

QUOTATION OF THE DAY "There has been no information presented at this trial that the defendant intended any crime to happen." BARRY G. WILLIAMS, the judge who ruled in Baltimore that Officer Edward M. Nero was not guilty in a case related to Freddie Gray.