In This Day in History 1915: German submarine sinks video clip: On the afternoon of May 7, 1915, the British ocean liner Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland. Within 20 minutes, the vessel sank into the Celtic Sea. Of 1,959 passengers and crew, 1,198 people were drowned, including 128 Americans.

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In a This Day in History video, learn that on July 5, 1996, a Scottish sheep named Dolly made history by becoming the first successfully cloned mammal. Dolly's debut gave birth to a hotly debated ethical dilemma.

In This Day in History video clip - May 5, 1961: The first American in space - Cape Canaveral, Florida, Navy Commander Alan Bartlett Shepard Jr. is launched into space aboard the Freedom 7 space capsule, becoming the first American astronaut to travel into space. The suborbital flight, which lasted 15 minutes and reached a height of 116 miles into the atmosphere, was a major triumph for the National Aeronautics and Space Administration (NASA).

On this day in 2002, the rusty iron gun turret of the U.S.S. Monitor broke from the water and into the daylight for the first time in 140 years. The ironclad warship was raised from the floor of the Atlantic, where it had rested since it went down in a storm off Cape Hatteras, North Carolina, during the Civil War. Divers had been working for six weeks to bring it to the surface.

In This Day in History video clip: On May 3, 1937, The airship Hindenburg, the largest dirigible ever built and the pride of Nazi Germany, bursts into flames upon touching its mooring mast in Lakehurst, New Jersey, killing 36 passengers and crewmembers. While attempting to moor at Lakehurst, the airship suddenly burst into flames, probably after a spark ignited its hydrogen core. Rapidly falling 200 feet to the ground, the hull of the airship incinerated within seconds.

This Day in History - May 16, 1929, was the day of the first Academy Awards. 270 people attended the awards with an admission of $5. Fifteen awards were presented with only one given to a female. All the recipients of the awards already knew they had won before attending. To find out more about this first big night of stars, check out this clip.

In This Day in History video clip: On May 27, 1941, the British navy sinks the German battleship Bismarck in the North Atlantic near France. The German death toll was more than 2,000. On February 14, 1939, the 823-foot Bismarck was launched at Hamburg.