This 'Countess of Computing' wrote the first computer program

On a summer Monday evening in 1833, Ada Byron and her mother Anne Isabella "Annabella" Byron went to the home of English mathematician Charles Babbage. Twelve days earlier, when the younger Byron met Babbage at a high society soiree, she had been taken with his description of a machine he was building. The hand-cranked apparatus of bronze and steel used stacks of cogs, hammer-like metal arms, and thousands of numbered wheels to automatically solve mathematical equations. But the Difference Engine, as Babbage called it, was incomplete. He had finished a small prototype that stood about two-and-a-half feet tall.