The first scientific hand-held calculators (HP-35) hit the markets with a hefty price tag at $395.
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King Carlos I of Portugal and his heir were assassinated in Lisbon.
The first volume of the Oxford English Dictionary was published.
Martin Luther King Jr. and 250 protestors were arrested.
Legendary rock singer Ozzy Osbourne announced his retirement from touring.
Thomas Edison completed the world's first movie studio in West Orange, New Jersey.
