HN has some "evergreens" hot topics that maybe could be separated:

  - Health (bad service in the US and nutrition), body hacks
  - University/education (decline / loan in the US, do I need a university degree to be a developer, Google/Amazon/Facebook favoring same top universities)  
  - Government surveillance and other threads to freedom  
  - What I like/disliked or how I moved from language A to B 
  - Tesla / electric cars, renewable energies  
  - Online scams, phishing etc  
  - drugs, war on drugs  
  - how broken are programmer interviews  
  - wealth distribution/inequality

have I missed any big topic? weekend project: parse HN (top) submissions and classify according to the above