This Day, That Year – November 11

Alvan Clark patented the telescope on this day in 1851.

Did you know that:

• German mathematician, Gottfried Wilhelm Leibniz, demonstrated integral calculus for the first time, to find the area under the graph of y = f(x) function, on this day in 1675
• Washington Irving’s Salmagundi periodical was published on this day in 1807 – first to associate the name “Gotham” with New York City
• Leonardo DiCaprio is an American actor and film producer born on this day in 1974