On: The event that eventually led to Newton writing an...

[divbzero]

1666 was the year Newton spent an extended period at home when an outbreak of the plague forced Cambridge to close. [1]

[1]: https://en.wikipedia.org/wiki/Annus_mirabilis

I like to imagine that someone somewhere is currently immersed in their own annus mirabilis and the fruits of those discoveries will be a silver lining to this terrible pandemic.