On April 10, 1866, the American Society for the Prevention of Cruelty to Animals was founded in New York by Henry Bergh.

In 1919, Mexican revolutionary Emiliano Zapata was assassinated by forces loyal to President Venustiano Carranza.

In 1963, the nuclear submarine USS Thresher sank east of Cape Cod, Massachusetts, killing all 129 aboard.

In 1971, the U.S. table tennis team arrived in China for a goodwill visit that came to be known as “ping-pong diplomacy.”

In 1998, the Northern Ireland peace talks concluded as negotiators signed the Good Friday Agreement, a landmark settlement to end 30 years of bitter rivalries and bloody attacks.

In 2019, scientists released the first image made of a black hole, revealing a fiery, doughnut-shape object 55 million light-years from earth.