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Clues examined in serial bomber case

Law enforcement officials from New York to Florida are examining clues to find the person or persons who sent 10 packages containing what appear to be explosive materials to prominent Democrats, critics of President Donald Trump, and to CNN's New York offices as authorities classify the incidents as domestic terrorism.

Astronaut recounts harrowing failed space launch

Two minutes into his first trip to space last Thursday, US astronaut Nick Hague found himself thinking how smoothly the flight was going. "It was everything I expected it to be," he told NASA director Jim Bridenstine at Johnson Space Center on Tuesday.

Ricin Fast Facts

Here's a look at ricin, a natural, highly toxic compound that is extracted from castor beans.