Sometimes, you only want to discover something new without searching it. That's serendipity. If you don't trust me with this thing, you can read the full article on Wikipédia (https://en.wikipedia.org/wiki/Serendipity).
This website is awesome. That's a 24/7 open library with a random article magic link. Feel free to overuse it, you might fall in love with things like:
Believe me, https://en.wikipedia.org/wiki/Special:Random is the link to click to discover something new each time. Btw, it's absolutly free, what else?
If you are in love with Wikipédia too, don't be rude donate: https://donate.wikimedia.org/ !