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In the 1880s, American dentist Dr Albert Southwick surprisingly worked to develop which invention?

893 – An earthquake destroys the city of Dvin, Armenia. 1612 – Galileo Galilei becomes the first astronomer to observe the planet Neptune, although he mistakenly catalogued it as a fixed star. 1795 – Construction of Yonge Street, formerly acknowledged as the longest street in the world, commences in York, Upper Canada, today’s Toronto. More…