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AI got cheap enough that Duolingo’s most expensive plan may not survive it. I read the earnings call transcript and opened the app to see what is actually changing for learners.
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Know Thyself - The Value and Limits of Self-Knowledge: The Examined Life
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See how the night and day sky appear to move differently from different latitudes on Earth using the Stellarium sky simulator.
An introductory lecture on using the Hertzsprung-Russell Diagram to analyze stellar properties and spectral classes.
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