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the newlyweds visited Augusta. During their stay, Byron banned his new wife from the drawing room and slept in the marital bed only when Augusta’s period began. Morehumiliations followed, including his threatening her, while she was pregnant, with a loaded pistol. To no one’s great surprise, Annabella left him on grounds of mental cruelty a year later. The subsequent court case, with its rumors of marital violence, incest, and sodomy, destroyed Byron’s social reputation and forced him into an exile on the Continent, from which he never returned.

    One of the patterns that links the group of lives in this chapter is how few of them went on to have children of their own. Leonardo and Newton were gay; Heaviside likely died a virgin. Freud did have six children, despite disliking sex, but was only really close—arguably too close—to his youngest, Anna. It is interesting to speculate what Byron would have been like as a father. Against the odds, Annabella did bear him a daughter, Augusta Ada Byron King, Countess of Lovelace, generally known as Ada Lovelace (1815–52), but he saw her only once, fleetingly. Thereafter, her mother did everything she could to protect the girl from the legacy of her father’s memory.
    Annabella, after her divorce, became a cold and domineering control freak. She delegated the upbringing of her child to three female staff members, whom Lovelace later called the Three Furies. They were spies as well as teachers: Lovelace was allowed no freedom of thought or action and was brought up on an unvarying diet of logic, mathematics, and science but “ not and never” poetry. She was twenty before she even saw a portrait of her father.
    The repressive parental regime backfired in an interesting way. Lovelace fulfilled her mother’s hopes by developing exceptional gifts as a mathematician, but she also proved herself her father’s daughter by bringing a poetic imagination to bear onmathematical problems. At thirteen, she was doing Leonardo-like calculations for a flying machine. By seventeen she had survived a debilitating bout of measles and run the full gamut of teenage rebellion from migraines and dramatic weight loss to an attempted elopement. She entered society, keen on both dancing and intelligent conversation. As one of the few women at the time who could talk passionately about algebra, she soon had a group of admirers that included the most eminent scientists of the day.
    One of these was the mathematician and engineer Charles Babbage, who was then trying to fund his difference engine, an 8-foot-high, 15-ton, 25,000-part mechanical calculator that he had hoped would render obsolete the notoriously inaccurate books of tables on which the whole financial system depended. The reason such tables were unreliable was that they were compiled by people, known as computers. (The first use of the word computer to mean any kind of calculating machine wasn’t until 1897, a quarter of a century after Babbage’s death.) Babbage failed to get his difference engine built, but he was very taken with Lovelace, and over the next few years he shared with her his plans for an even more ambitious project: an analytical engine, a larger, steam-driven calculator that could be programmed by adapting the punched cards recently used to automate French silk looms.
    Babbage could see Lovelace’s money and connections would be helpful, but he couldn’t have anticipated how fully she would understand the machine’s potential. Despite being married with three children under eight, she offered to translate a description of the engine produced by the Italian philosopher Luigi Menabrea. Her work so impressed Babbage that he asked for her notes. They turned out to be three times the length of the original text. Published together, the book became an instant bestseller. Itwas, after all, by Byron’s daughter on a subject women weren’t supposed to understand. It is also a key text in the history of computing. Not only