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The teacher, a reserve police officer, discharged his firearm during a lesson. Debris fell from the ceiling, and no one was injured. The teacher has been placed on leave.

Students in Helena, Mont., who participated in Wednesday's walkouts called it a memorial, not a protest — unlike demonstrations across the U.S. that explicitly called for laws to restrict gun rights.

Holmes and Theranos promised to revolutionize blood testing. The SEC says they raised $700 million by making "false statements about the company's technology, business, and financial performance."

The Trump administration imposed new sanctions against individuals and entities over their alleged role in Moscow's interference in the 2016 U.S. presidential election.

After having trouble obtaining drugs needed for lethal injections, state officials plan to change the primary method of execution to nitrogen gas inhalation. It would be a first for a U.S. state.

The evolution of artificial intelligence has exploded over the past five years, leading to computers that can drive and talk. New York Times' Cade Metz explains how machines are learning on their own.

They say it shows his willingness to solidify his role as Saudi Arabia's next king. U.S. intelligence analysts reportedly think he believes his mother opposes his rise to the throne.

The author's lawyer says a contract bars the producers of a high-profile stage adaptation from departing "in any manner" from the spirit of the classic novel.

A study shows that not only do astronaut's genes change in space, but they have the potential to remained changed even months after the astronaut is back on Earth.

Farmers are fearful of retaliation from China to the tariffs President Trump imposed on aluminum and steel. American Soybean Association president John Heisdorffer speaks with NPR's Sarah McCammon about a letter he sent to Trump this week urging him to change his mind.