The links to Bell's spaceship paradox and relativistic mass in the relativity FAQ lead to the black hole. I see the articles have been removed from the STEM learning materials section. I assume this has got to do with their being relegated to the Insights section. Perhaps fixing the link, so that it leads to the appropriate Insights article would be in order. A complete removal of the entry from the pinned post in the relativity section would be an alternative - but personally I'd rather see all the FAQ entries accessible from one place.