Musical.ly and TikTok merged, combining the users of both apps to form one community.
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English clockmaker Daniel Quare gained the patents for a portable barometer to measure air pressure.
Letter collections started being collected from mailboxes in Boston, US.
Britain took power over the Indian government.
The Tower Subway in London became the first underground tube railway to open.
Researchers in South Korea developed a tattoo that monitors a person's health.
