[0942v8653]

I've been adding the bang at the end of the string for years, and you can even add it in the middle:

    hacker news !g
    hacker news!g
    hacker !g news
    hacker!g news

all work.

[13of40]

I must be too dumb to use this feature, because everything I enter, including the examples from the page, gives me "No Results Found". (Seems like it works from the main page, though.)

[boomboomsubban]

The page linked here is a searchable list of what bangs exist, like !hn for hackernews.

[melonbar]

Awesome, stellar tip.