Inventor Thomas Savery patented the first steam engine in England.
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Martin Luther was almost struck by lightning and became a monk.
The International Astronomical Union named Pluto's fourth and fifth moons Kerberos and Styx.
American aviator Amelia Earhart disappeared.
North and South Vietnam were formally reunified after more than twenty years of war.
Inventor Benjamin J. Lane patented the first self-contained gas mask.
