On May 18, 1896, the U.S. Supreme Court, in Plessy v. Ferguson, endorsed “separate but equal” racial segregation, a concept renounced 58 years later by Brown v. Board of Education of Topeka.

1910, Halley’s Comet passed by earth, brushing it with its tail.

In 1927, in America’s deadliest school attack, part of a schoolhouse in Bath Township, Michigan, was blown up with explosives planted by local farmer Andrew Kehoe, who then set off a bomb in his truck; the attacks killed 38 children and six adults, including Kehoe, who’d earlier killed his wife. (Authorities said Kehoe was seeking revenge for losing a township clerk election.)In 1973, Harvard law professor Archibald Cox was appointed Watergate special prosecutor by U.S. Attorney General Elliot

On May 18, 1896, the U.S. Supreme Court, in Plessy v. Ferguson, endorsed “separate but equal” racial segregation, a concept renounced 58 years later by Brown v. Board of Education of Topeka.

In 1910, Halley’s Comet passed by earth, brushing it with its tail.

In 1927, in America’s deadliest school attack, part of a schoolhouse in Bath Township, Michigan, was blown up with explosives planted by local farmer Andrew Kehoe, who then set off a bomb in his truck; the attacks killed 38 children and six adults, including Kehoe, who’d earlier killed his wife. (Authorities said Kehoe was seeking revenge for losing a township clerk election.)

In 1973, Harvard law professor Archibald Cox was appointed Watergate special prosecutor by U.S. Attorney General Elliot Richardson.

In 1980, the Mount St. Helens volcano in Washington state exploded.

In 2004, Randy Johnson threw the 17th perfect game in major league history in a 2-0 Diamondbacks win over the Braves.