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Ask HN: How did you build up your personal knowledge base? | Hacker News
https://news.ycombinator.com/item?id=21332957
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Software for research, learning and self-study
Ask HN: What's a promising area to work on? | Hacker News
https://news.ycombinator.com/item?id=21324768
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Divesting AdSense might help Google stave off worse regulatory action | Hacker News
https://news.ycombinator.com/item?id=22255318
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Google
I think it's ok to use the up and down arrows to express agreement. Obviously t... | Hacker News
https://news.ycombinator.com/item?id=117171
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Paul Graham and Y Combinator