On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
If you were a frequent here, and represenative of the HN crowd (something which your question implies being), you'd have seen the same question time and again, and always the same answer posted from HN guidelines:
"On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity".
Obviously I'm being facetious, but it's interesting and potentially useful as many of the readership are American and may not be familiar with this element of their countries history.
On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.