> The full menagerie of shapes is too diverse to get a handle on, so mathematicians tend to focus on convex polyhedra
The phrase "tend to focus on" suggests it's not an exclusive thing. However, you're right -- it appears that the Rupert property only applies to convex polyhedra, so the article title and text is at the very least incomplete given that a sphere is a shape.
> If you start something new from this code and it becomes successful, guess who is going to come out of the woodwork and want a portion of it?
This is literally the reason lawyers exist. It’s not hard to draft up an agreement where the former co-founder transfers all rights and ownership and relinquishes any claim to the technology.
This could be implemented minimally and cleanly by having a "save" link appear once you click into the comments for that story, much like how "flag" appears for individual comments. Upvote would +1 the submission and not save it. Clicking "save" would save the submission and not +1 it.
This would let users indicate "This was a very worthwhile story for HN, but I have no desire to read it again" (upvote) or "I'd like to read this later, but I'm not sure it's HN worthy" (save)... or save and upvote. The placement of the "save" link only once you click through to the comments keeps the home page as it was and only introduces one discreet new option.
Will there ever be the ability to upvote a story without it going into your "Saved stories" section? 99% of the time I upvote a story it's because I want to save it for future reference. I'd like the ability to upvote (and downvote) stories based on whether they're HN-worthy without it impacting the "Saved stories" section.