The finalized copy of the United States Declaration of Independence was signed by congress.
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Researchers in South Korea developed a tattoo that monitors a person's health.
Letter collections started being collected from mailboxes in Boston, US.
A bomb exploded at the railway station in Bologna, Italy.
The Tower Subway in London became the first underground tube railway to open.
English clockmaker Daniel Quare gained the patents for a portable barometer to measure air pressure.
