One aspect HN offers me is the wide variety of content. If using a website like reddit, for example, you may not see this kind of article if you're not subscribed to a relevant subreddit. This can be good as you mostly see things you want to see. But, this design doesn't always show you things you wouldn't already see and HN does that for me. I'm familiar with the general concept of RF waves but still learned a lot from this article. I wouldn't have learned this information otherwise as I haven't told my various personalized websites that I want to see this kind of content, yet I'm happy I saw this. It's my opinion that the breath of topics on HN is very good and is a major reason I use it -- to see things people like me are interested in that I may not yet know about