1833: Ada Byron meets Charles Babbage. He designed an early computer, and she would write the first computer program.

Ada's father was the poet Lord Byron, but her parents separated when she was a month old. Her famous -- and poetically wild -- father went to Greece, and she never knew him.

Ada was 15 when she met the Cambridge mathematics professor Babbage 175 years ago today. Babbage had already received funding from Parliament to build a "difference engine" that could do mathematical calculations. While that project was still unfinished, he conceived in 1834 a new and broader idea: an "analytical engine" that "could not only foresee but could act on that foresight."

She also wrote a plan for the analytical engine to calculate Bernoulli numbers. It's now considered the first computer program. The countess originated the idea of a loop in a program, which she likened to a "snake biting its tail."