[pixelpoet]

Guaranteed this is the case, I see it a lot too. They've done it twice before on previous submissions: https://news.ycombinator.com/item?id=44755116 and https://news.ycombinator.com/item?id=44785347

In case anyone is curious, the way to phrase it as a question would be, "How does randomness improve algorithms?"

[jvanderbot]

Weirdly, "Why randomness improves Algorithms." Is closer to the truth and also cannot be expressed correctly with a question mark.

[prerok]

Indeed. Well, FWIW, the title translated into my native Slavic language would also make no sense with a question mark.

What's interesting is that both How... and How does... would translate into the same words but with a dot or a question mark at the end it would mean two different things.

That said, that would be true for many languages.