every time this question comes up, the same answer is given. From the first paragraph of the guideline: On-Topic: Anything that good hackers would find interes

every time this question comes up, the same answer is given. From the first paragraph of the guideline: 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.