The Civil Marriage Act was introduced, making same-sex marriage legal in Canada.
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Isaac Briggs & William Longstreet was awarded a patent for the first steamboat in the US.
Thomas Edison completed the world's first movie studio in West Orange, New Jersey.
The first scientific hand-held calculators (HP-35) hit the markets with a hefty price tag at $395.
King Carlos I of Portugal and his heir were assassinated in Lisbon.
An atomic bomb explosion was aired on TV for the first time.