The finalized copy of the United States Declaration of Independence was signed by congress.
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Adolf Hitler became Führer of Germany following the death of President Paul von Hindenburg.
English clockmaker Daniel Quare gained the patents for a portable barometer to measure air pressure.
Samuel Briggs and his son patented his nail-making machine.
Researchers in South Korea developed a tattoo that monitors a person's health.
Musical.ly and TikTok merged, combining the users of both apps to form one community.
