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The U.S. says that Abu Sayyaf, a senior leader of the self-declared Islamic State, was killed during a U.S. military operation authorized by President Obama.

The Federal Railroad Administration has instructed Amtrak to install new automatic control systems on its northbound trains near the area of this week's derailment and to assess risks at all curves.

Astronomer Chris Impey discusses the future of space travel, sex in space and the connection between science and Buddhism. Originally broadcast May 11, 2015.

The launch is the latest in a string of failures for the Proton-M rocket, a workhorse for the International Launch Services, a joint Russia-American satellite carrier business.

A day after convicted Boston Marathon bomber Dzhokhar Tsarnaev was given the death penalty, Bostonians are grappling with the jury's sentence and bracing for legal appeals.

When the price of gold skyrocketed, illegal miners flooded into the country's Amazon basin, eager to find even the tiniest bits of the precious metal. Trees and villagers have paid a price.

The 2016 presidential race is off to a slow start compared to the last two cycles. But the activity is starting to heat up in Iowa, where official and potential candidates spoke at a GOP dinner.

Los Angeles was the top city for dog attacks on postal workers last year. A training program teaches letter carriers how to protect themselves.

Lance Rice, a recovering heroin addict, became friends with Nina Rossi, whose house he robbed in 2013. The friendship waned after Rice had a relapse, but they still have kind words for each other.

Ethan and Joel Coen spent months searching for the right actress to play Mattie Ross in their 2010 film True Grit. Then, just weeks before filming, Hailee Steinfeld showed up — dressed in character.