On April 4, 1841, William Henry Harrison became what?

Question

In February 1841, English polymath, inventor, politician and scientist William Henry Fox Talbot patented a process which was seminal in the development of what?

Answer 1

The first US President to die in office
He was inaugurated as the ninth President on March 4, 1841. He died 31 days into his term. In that short time he became the US head of state to give the longest presidential inaugural address, and hold the office for the shortest term. As of 2019 he still holds those records.