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Pick some unrelated lectures, they said.
(sh.itjust.works)
It will widen your horizon, they said. And here I was, foolishly thinking I could get away with half-assing statistics during my degree.
It always got me that the maths I was doing in electrical engineering outclassed what my friend was doing for his astrophysics degree. He was probably at the better university too (Debatable for the subjects in question, but both really good).
Did I need that level of maths? No, but it was compulsory for the first 3 years so not much option.