The black bar is sometimes added if important persons have died, in this case Andy Grove: <a href="https://news.ycombinator.com/item?id=11333402" rel="nofollow">https://news.ycombinator.com/item?id=11333402</a><p>bar-related discussion:
<a href="https://news.ycombinator.com/item?id=11335903" rel="nofollow">https://news.ycombinator.com/item?id=11335903</a>