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. [0]
For example, having learned about mummia, I might incorporate it as an item or crafting ingredient in a game :) and a player might learn about this through that, which may inspire them on to something else.
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What's the point of random wiki pages on hacker news though?
[0] https://news.ycombinator.com/newsguidelines.html
To generate discussion from a modern point of view.
There is nothing new under the sun, and inspiration can come from anywhere.
For example, having learned about mummia, I might incorporate it as an item or crafting ingredient in a game :) and a player might learn about this through that, which may inspire them on to something else.