Adolf Hitler became Führer of Germany following the death of President Paul von Hindenburg.
Source
A bomb exploded at the railway station in Bologna, Italy.
English clockmaker Daniel Quare gained the patents for a portable barometer to measure air pressure.
The Tower Subway in London became the first underground tube railway to open.
Letter collections started being collected from mailboxes in Boston, US.
Researchers in South Korea developed a tattoo that monitors a person's health.
