Julia Evans has been making comics and zines for years. You've likely learned "How to be a wizard programmer" from one of Julia's comics. She's a software developer at Stripe in her day job and on this episode she talks to Scott about how to effectively teach and learn computer concepts.
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A podcast does not come with subtitles, so podqast makes them: it listens to the episode itself, a few minutes at a time, and only around where you are listening. Nothing is done in advance, which is why the bar says how much of the episode you can read so far.
Each stretch is heard by a speech model, cut into lines at the pauses and full stops, and translated in one go — what was said on top, English under it, and the two lit together piece by piece as they are spoken.
It is a machine doing it, so it is wrong sometimes. What was said is always the line on top.