In 1828, a 12-year-old girl calculated the ratio between a bird's wingspan and body weight, drafted a book she called Flyology, and planned to fly across England using mechanical wings and steam power. Her mother was terrified, because this methodical child was Lord Byron's only legitimate daughter.

This episode traces how Augusta Ada King, Countess of Lovelace, fused poetry and cold mathematics into what she called poetical science, and became the first person to look at brass gears and see the blueprint for a modern computer, a full century before electronic machines existed.

• Her mother's attempt to math away the Byron madness, the surveillance friends Ada nicknamed the Furies, and how suppression backfired into genius
• The 1833 meeting with Charles Babbage, who called her Lady Fairy and the Enchantress of Number
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