1973- Gold is a record $95/ounce in London.
1912- the 1st airplane flies over 100mph.
1872- Cyrus Baldwin patents the Hydraulic electric elevator
1967- Construction began on the Calgary Tower, a $3.5-million-dollar project in Alberta, Canada.
1745- Inventor of the battery, Alessandro Volta, is born.
1817- Gas is used for the first time to light a city in the United States (Baltimore).
https://youtu.be/Jzug5VjuKLg
https://youtu.be/UyOdS5b6gMU
https://youtu.be/0_yzDt6KFBM
https://youtu.be/hJimHqz97Pk