May 7th in history:

The British ocean liner Lusitania was torpedoed by a German submarine on May 7th, 1915. Nearly twelve hundred people aboard the ship died, including 128 Americans. The sinking is considered to be a major factor which led the U.S. into World War I, two years later.

On this date in 1960, Soviet leader Nikita Khrushchev  announced that American pilot Francis Gary Powers had been captured. Powers was flying a U-2 spy plane over the USSR when he was shot down on May 1st.

One of the scientists who developed the optics used on the U-2 was Edwin Land, inventor of the Polaroid camera. Land was born May 7th, 1909.