On March 18, 1925, nearly 700 people died when the Tri-State Tornado struck southeastern Missouri, southern Illinois and southwestern Indiana; it remains the deadliest single tornado in U.S. history.

The replacements for the astronauts involved in NASA's first medical evacuation are on their way to the International Space Station. SpaceX launched the fresh crew on Friday from Florida. The four astronauts are representing the U.S., France and Russia and should reach the orbiting lab Saturday. They'll fill the vacancies left by their evacuated colleagues. NASA had to put spacewalks on hold and defer other duties after an unidentified astronaut experienced a serious medical issue in January. The entire crew returned to Earth more than a month early, leaving three astronauts in orbit.

On March 18, 1925, nearly 700 people died when the Tri-State Tornado struck southeastern Missouri, southern Illinois and southwestern Indiana; it remains the deadliest single tornado in U.S. history.

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In 1792, France’s King Louis XVI went before the Convention to face charges of treason. (Louis was convicted, and executed the following month.)

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In 1792, France’s King Louis XVI went before the Convention to face charges of treason. (Louis was convicted, and executed the following month.)