From the submission guidelines: >What to Submit >On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If

From the submission guidelines: >What to Submit >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. Also from the submission guidelines: >Please don't submit comments complaining that a submission is inappropriate for the site. If you think a story is spam or off-topic, flag it by clicking on its "flag" link. (Not all users will see this; there is a karma threshold.) If you think a comment is egregious, click on its timestamp to go to its page, then click "flag" at the top.