Adolf Hitler became Führer of Germany following the death of President Paul von Hindenburg.
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Letter collections started being collected from mailboxes in Boston, US.
Researchers in South Korea developed a tattoo that monitors a person's health.
Britain took power over the Indian government.
Andrew Hallidie introduced the cable car to San Francisco after witnessing a horse and carriage accident.
A bomb exploded at the railway station in Bologna, Italy.
