The Trump administration has announced new sanctions and penalties against Cuba, Venezuela and Nicaragua aimed at both ending the rule of Venezuelan President Nicolás Maduro and weakening Cuba's communist regime.

One of the measures will allow lawsuits against foreign companies operating on property in Cuba that was seized from U.S. citizens during the Cuban revolution — a reversal of more than 20 years of U.S. policy.

Updated at 11:23 a.m. ET

Special counsel Robert Mueller detailed 10 "episodes" involving actions by President Trump that might have constituted obstruction of justice, Attorney General William Barr said on Thursday morning — but the Justice Department concluded they did not amount violations of the law.

Barr said he is satisfied that Trump had "non-corrupt motives," prompting the attorney general to decide not to prosecute the president for obstruction.

Virginia Hall is one of the most important American spies most people have never heard of.

Her story is on display at the CIA Museum inside the spy agency headquarters in Langley, Va. — but this is off-limits to the public.

"She was the most highly decorated female civilian during World War II," said Janelle Neises, the museum's deputy director, who's providing a tour.

Pennsylvania's soon-to-be official amphibian has more than its fair share of nicknames: snot otter, mud devil, Allegheny alligator, devil dog, lasagna lizard.

In short, it's not exactly a looker.

On April 20, 1999, as two students carried out the deadly shooting at Columbine High School, senior Heather Martin was barricaded in a choir office with 60 other students. It would be several hours before emergency responders found the room and were able to help the group get out.

"I only saw the aftermath," she said. "I didn't see anything as it was happening." But she was shocked to find out that the perpetrators were two of her peers, including one she had grown up with.

It took her 10 years to return to her alma mater.